Wifi networks become disabled - Xperia Z4 Tablet Q&A, Help & Troubleshooting

I obtained the Z4 tablet as a replacement for my broken Note 10.1. It is running rooted with (now) current 8.260 firmware and AndroPlus v10 (before 7.24 and AndroPlus v2).
Solely with this device, I experience that single wifi networks become disabled. Here at home, I have three hotspots (partly with 2.5 and/or 5 GHz) on different SSIDs.
All SSIDs configured with the correct password, SSID by SSID is disabled for an unknown reason until the device switches to mobile network.
This effect does not happen for my S6 Edge and before One M 8, Note 10.1 or any other Android device (Fire HD Tablet, Tab 8.5).
Same happens if I am anywhere else where I have wifi access, also with my HUWAI mobile access point.
With the app Wifi-Fixer, the SSIDs get reenabled, but while running the app, I experienced regularly that the device became laggy and unresponsiveness until I had to reboot it.
Anybody an idea how to fix this?

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[Q] Crippling Wifi issues - Please help

Hello everyone,
I'm a longtime lurker of XDA ever since I switched from my Palm Pre (RIP) to an HTC Evo 3D. I created an account finally to post this question and I'm hoping someone can help because I am at the end of my rope.
My Nexus 9 has a wifi issue that cripples my entire network. First, I'll give you the details of my configuration and the problems I'm running into:
Running an ASUS RT-AC66R on Centurylink DSL. I have tried both the 2.4 and 5GHz bands. I have tried multiple channels per band with no effect on the issues listed below. The 5GHz band is currently disabled.
Unless I am am running the factory image that came with the N9, my wifi connection will almost completely dry up across every device on the network when the N9 is connected. As far as I know, this only happens on my home network.
Restoring the N9 to factory settings - which I have now done twice since purchasing it on Nov 3 - eliminates this problem almost entirely until I install the OTA update. This problem happened with both the day one patch and persists in the recent update to 5.0.1.
If I am playing my PS4 or streaming Netflix (or anything that requires a connection), I notice the connection speed rapidly drops to somewhere in the range of 0-5 kb/s as soon as my N9 connects to the network. When I deactivate the N9's wifi, the connection returns to normal speed immediately.
I am still connected to the network when speeds are low, but data crawls. I am able to connect to the router's config page and can see that traffic caps out at about 5kb/s down and 60 kb/s up.
Here are some of the fixes I've attempted, which all failed to produce results:
resetting the router
resetting my modem
disconnecting all other devices
switching channels on the 2.4 and 5GHz bands manually
updating the firmware of the router
changing the network name
changing the network password
changing the network security type
I am typing this after having reset my N9 to factory settings for the second time to confirm that the issue lies within one of the firmware updates. Can someone please help a networking noob figure out how the connection of one device quickly (within 15 seconds) halts all traffic?
I should mention that the exact same issue was present on my N5 earlier this year (long before Lollipop arrived) but that it eventually worked itself out and stopped hijacking my network. Unfortunately without mobile data on my N9, it is essentially useless until I figure out the issue.
Thanks in advance for any help!
The first thing that came to mind is an ip conflict. Have you tried changing to a static ip on your nexus 9?
Edit: Also when your nexus 9 is connected check and make sure the ip address on your other devices jives w/ you router (you may need to make all devices static until you find the problem) I had the same router as you and i had a network switch that was throwing odd ip address to devices not even attached to it...
I updated to 5.0.1 again and didn't have any issues this time around. I went ahead and set a static IP anyways but I'll report back here if I have any issues. Thank you!

Fixes for slow and dropping wifi

(April 24th, 2015) After searching for a solution to my wifi dropping I collected a comprehensive list that has helped in one way or another. After seeing similar issues on S5 phones it appears this isn't solely a S6 problem. If you find or have used a method not on the list please report and I'll add it.
Possible fixes for Galaxy S6 WiFi problems:
Factory Reset
“Forgetting” your Wifi Network and Reconnecting
Settings ->Wi-Fi. Hit menu then Advanced. Make sure Keep Wi-Fi on is set to Always.
Settings, more networks, mobile network, uncheck Connection Optimizer
Under the Wi-Fi settings uncheck "Smart Network Switch"
Resetting the Modem/Router
Settings→wifi→WPS Button and same button on modem/router to 'lock on'
Switching from DHCP to Static Connection on Phone
Connect to your router's 2.4GHz band instead of 5GHz
Install a DNS changer app, select primary/secondary servers to Google or yandex.
Changing the Router Bandwidth Settings
Changing the Router’s Broadcast Channel
Adjusting the router security settings to WPA or WPA2
Enable WMM in your router settings
Disable IPV6 in your router settings
Calling your ISP and upgrading to a Higher Bandwidth/Speed
Wipe phone cache
1) Power off the Samsung Galaxy S6
2) Hold the power off, volume up and the home button all at the same time
3) After some seconds, the Galaxy S6 will vibrate once and the recovery mode is started
4) Search for the entry called “wipe cache partition” and start it
5) After a few minutes the process is complete and you can restart the Galaxy S6 with “reboot system now”
Disable phone's wifi power saving mode
1) Open your phone dialer
2) Enter *#0011#
3) Select more (top right)
4) Select WiFi
5) Turn off WiFi power save mode(enabled by default)
6) Exit and hopefully your WiFi connectivity issues will no longer be a problem
Click to expand...
Click to collapse
(April 11th, 2015) Anyone experiencing wifi dropping out? It seems to happen when I require it, ie browsing themes or downloading apps. It will lose wifi and the lte icon appears and the screen freezes temporarily until wifi is restored. Last night this happened like 6 times one after another which wasd very annoying.
WiFi working petectly fine connected to my as router
Sent from my Samsung Galaxy s6 Edge
Yes, I am having the same issue. WiFi drops out, screen freezes and then WiFi comes back and everything works again :/
It seems to have settled down a little now, only seems to happen when there is quite a bit of WiFi activity.
It kept happening to me while I was downloading a GPS map and also when syncing Spotify.
I am connected to a 5GHz AC router, what sort of connection are you using?
Yes,
My device has also done this also around 4 - 5 times and i was thinking could it be Smart Network Switch which is on for me.
i have also noticed the wi-fi has dropped out for when the phone is asleep and i awake it.
`````If smart network switch is enabled, your device will be connected to a mobile network automatically when the Wi-Fi connection is unstable. `````
Master2k5 said:
Yes,
My device has also done this also around 4 - 5 times and i was thinking could it be Smart Network Switch which is on for me.
i have also noticed the wi-fi has dropped out for when the phone is asleep and i awake it.
`````If smart network switch is enabled, your device will be connected to a mobile network automatically when the Wi-Fi connection is unstable. `````
Click to expand...
Click to collapse
I don't have Smart Network Switch enabled, so it isn't that for me.
My WiFi always stays connected through sleep though.
What sort of connection are you on? G/N/AC/2.4GHz/5GHz?
IakobosJ said:
I don't have Smart Network Switch enabled, so it isn't that for me.
My WiFi always stays connected through sleep though.
What sort of connection are you on? G/N/AC/2.4GHz/5GHz?
Click to expand...
Click to collapse
i am on a 5GHz BT hub 5
My Smart Network Switch is off and I'm in the same room as my router so signal or the setting isn't the issue. Anyone using a Sprint Airsve in-home signal booster?
Liksys E4200 802 11 N router
I'm going to a friend's house later and will see if the same issues occur on his network.
I'll be able to do some tests at work tomorrow.
I haven't had it happen today at all :/
I downloaded Angry Birds Space 3 times this morning and no wifi drops. I was on the road and something locked up where I couldn't swipe between home screens or open the app drawer, noted I had wifi on even though I was in the car outside of a network. Didn't get to test the wifi at my friend's house but just tried downloading AB again and wifi dropped out.
This is getting annoying. Thinking I might see about going in to BB to exchange, this isn't a glitch I can live with or risk being a hardware defect. I plan on contacting Samsung to make sure they make a note, hopefully they are aware of this.
Galaxy S6 (not the edge.) Same issue. Wifi drops. Music stutters. Have to turn wifi off and back on to reconnect. Using Apple airport express.
Same thing here with galaxy s6 edge. Wifi keeps dropping out. Web pages too slow to load.
Will return the phone tomorrow.
Sent from my SM-G900W8 using XDA Free mobile app
Jesus, these phones are gitchy as all hell. I get mine Thursday. Going to mess around with it for a week and if I keep having these same problems I'm just going to return it and move to something else. I've never seen soo many issues with a new phone in both software and hardware.
If anyone can test other wifi networks or exchange phones, please report back with results.
Googling turned up a similar problem people had with the S5, some found fixes while others didn't.
http://forums.androidcentral.com/sa...msung-galaxy-s5-constantly-dropping-wifi.html
Another link lists some speed fix options for the S6
http://recomhub.com/blog/how-to-fix-samsung-galaxy-s6-slow-wifi-problem/
How to Galaxy S6 slow WiFi problems:
Factory Reset Galaxy S6
“Forgetting” your Wifi Network and Reconnecting
Resetting the Modem/Router
Switching from DHCP to Static Connection on Phone
Switching DNS to Google’s Addresses on Phone
Changing the Router Bandwidth Settings
Changing the Router’s Broadcast Channel
Adjusting the Modem/Router Security Settings and even Disabling Security
Calling your ISP and upgrading to a Higher Bandwidth/Speed
How to fix slow wifi on Galaxy S6:
Power off the Samsung Galaxy S6
Hold the power off, volume up and the home button all at the same time
After some seconds, the Galaxy S6 will vibrate once and the recovery mode is started
Search for the entry called “wipe cache partition” and start it
After a few minutes the process is complete and you can restart the Galaxy S6 with “reboot system now”
Click to expand...
Click to collapse
I tried a few of those, others aren't necessary. I did 2 factory resets and the wifi was fine downloading 54 apps but dropped at the last one, and lasted all 55 but dropped later. I'm going in for an exchange tomorrow unless someone posts a magic fix.
The Recomhub website helped me fix my WiFi dropping problem. Thanks for the link, it really solved my issues!
5GHz Network
I've been testing this, because it is really annoying me now.
When I am connected to my 5GHz AC Network at home it drops out and freezes the phone quite a bit.
When I am connected to my 2.4GHz N Network at home, there is never an issue. Wireless actually seems to work better on this network.
So, for me at least, this problem is being caused by the 5GHz networks and switching back to 2.4GHz makes the problem go away.
This is an annoying bug, I have emailed Samsung about it, let's see if anyone replies.
My router is Simultaneous Dual-Band N (2.4 & 5 GHz) so I wonder if that is causing my issues. No idea how to remedy it at the moment.
rank78 said:
My router is Simultaneous Dual-Band N (2.4 & 5 GHz) so I wonder if that is causing my issues. No idea how to remedy it at the moment.
Click to expand...
Click to collapse
Mine is too, but I have the ability in the router to separate the two networks, so my 5GHz network has a different SSID than the 2.4GHz one.
I've been connected to the 2.4GHz network all of tonight and done quite a bit of downloading to test it and it hasn't dropped out once, yet on 5GHz it would have done it at least twice already by now.
I cannot replicate this problem at work on the 5GHz Network. It must be something to do with the channels they are set at.
I will try and change some channels on the work network, see if I can get it the same as at home and then test again.
I have a call booked with Samsung who are going to remote my phone, hopefully they can pinpoint something
I can't even connect to my home's 5GHz, the 2.4GHx is what I'm testing.
I went to BB Wednesday and the Samsung rep wasn't aware of any wifi issue or remedies beyond what is mentioned in this thread. Of course I didn't lose wifi the brief time on their wifi network so the guy didn't know what to say other than contact Samsung support.
I tested this at my house last night.
64GB White Edge AT&T on 5.0.2
E3000 router with DDWRT
N700 Router with DDWRT
Both dual band, both running 2.4 and 5 Ghz
Both set to 40 channel width
Both with channels spanned correctly for no overlapping
Never lost connection while downloading and updating all apps throughout about 2 hours of use. Speeds saturated my broadband link (50Mbits/Sec) and never had a problem. However, I don't know about battery drain as I'm brand new and still letting everything settle for another few days before commenting/testing.

S9+ showing "connected to WLAN, no internet"

So, I got my S9+ (international version, DUOS, 256 GB) last week from the Samsung store. I am on stock ROM (and will stay as long as my warranty lasts or someone finds a way to root with Knox 0x0, which I am not expecting).
At home, I have a WLAN Mesh (AVM Fritz!Box 6590 Cable, 2x AVM Fritz! 1750E Repeater on a wired connection), everything working great with any device.
Except my S9+. It connects and everything is fine, at some point - especially when using it for e.g. streaming Netflix or so - it will stay connected to the WLAN but will say "no internet access". Switching WLAN on and off fixes the issue until it happens the next time (minutes to hours later). I have no special settings, no neighbouring networks which would interfere. I have 2,4 and 5 GHz active and automatic channel selection. All other devices in my home work with no problems. I have found similar issues froim users on other Samsung phones (S6/7/8 series (my former S5 on Resurrection Remix Oreo does not show t his behaviour)), but no answers that worked (like forget the network, reboot and reenter credentials).
Quite annoying, anyone knows a fix? Big THANKS in advance.
No one experiencing the same thing or havin any ideas?
I have had the same issue in the beginning with the phone. I have a router with a cisco switch connected to it. The standard router's wifi wasn't sufficient in coverage through my house. I got hold of a cisco AP and connected it to the switch and disabled the wifi on the router. That's when my issue started. Fiddled around trying various options, but the one that worked for me was to tell the phone to forget my network, restart the phone and then "setup" the wifi on the phone again(password for wifi needed to be entered as it sees the network as a new one) Haven't had the issue after that. I did notice at my office that even though the wifi conection is good, that if it goes below a certain percentage, the mobile data will kick in, although I have that option switched off. I also picked up that if your line connection's speed goes very low for whatever reason, the same problem appears again that the phone assumes there is no internet
Thanks, this is what I've read from other threads (with S7, S8), too. But this didn't work for me. My repeaters get ther signal through LAN cable and I have a fast connection, coverage all over my house and garden. I really do not have an idea on what to try...

Disable WiFi connectivity test ("Connected, No Internet")

I'm using a Pixel 2, with the latest updates, and I'm constantly getting issues when roaming WiFi within my house.
I have 3 AP's from Mikrotik, properly configured, and I don't have no issues at all with other devices like my iPad or Surface Pro/Book, etc.
But once in a while, my Pixel get's stuck in the state "Connected, No Internet" and it keeps retrying... until after a couple of minutes (5 or more) it properly connects...
Is there a way to disable this?
Another thing that I've noticed is that often the device only connects to the WiFi (switching from LTE) only when I unlock it or wake up the device. Have anyone noticed something similar with Pixel 2 or other devices? Any recommendations?
Cheers,
anthonws.
Hey, I don't own a Pixel but a Note9 but would certainly try to help you.
Do you have 2.4 Ghz router or do you connect to a 5 GHz SSID? If yes to the former, have you tested different channels. Interference in some rare cases can cause unstable internet. You can use the Wifi Analyzer app on the play store to test.
I had fixed a similar problem on my older S7e by assigning static IP to it. Try this as well. Static IP can be configured on your router as well as on your device itself.
Android do has options to set Wifi Aggressiveness. See if you have set Wifi Aggressive Mode (it connects to Mobile data even if Wifi is slightly unstable). There's also two more options (in developer options) that are worth checking: Wifi safe mode and Wifi power saving mode.
I understand that these options are hard to find and that's what made me initiate this guide. Do have a look.
Sent from my SM-N960F using Tapatalk
Paras Lehana said:
Hey, I don't own a Pixel but a Note9 but would certainly try to help you.
Do you have 2.4 Ghz router or do you connect to a 5 GHz SSID? If yes to the former, have you tested different channels. Interference in some rare cases can cause unstable internet. You can use the Wifi Analyzer app on the play store to test.
I had fixed a similar problem on my older S7e by assigning static IP to it. Try this as well. Static IP can be configured on your router as well as on your device itself.
Android do has options to set Wifi Aggressiveness. See if you have set Wifi Aggressive Mode (it connects to Mobile data even if Wifi is slightly unstable). There's also two more options (in developer options) that are worth checking: Wifi safe mode and Wifi power saving mode.
I understand that these options are hard to find and that's what made me initiate this guide. Do have a look.
Sent from my SM-N960F using Tapatalk
Click to expand...
Click to collapse
Hi,
Thanks for the reply. My WiFi is properly tuned. No channel overlapping. I'm using 5Ghz band only, same SSID and different channels, and bespoke antenna gains to reduce signal overlap.
None of those options are available in Google Pixel 2. No Power Save Mode and no Safe Mode. Only the option to have Mobile connectivity in background for Fast Switching.
My ask is more towards on how to disable the connectivity check from Android. Nothing else. I know I have Internet access. I know my AP's are all working properly. It's just something with Android...
anthonws

Tab S6 Wifi problems / Detects only a few or no wifi networks at all

As title says, just bought the device and it only picks up like 1 or 2 networks (not always) from like 10 available ones when I am at home. However, this problem is really apparent in my college dorms as I can't pick up any wifi network whatsoever making my tablet practically useless in dorms. Is this a software problem? or a hardware one? When I was at my home I was able to find my home network easily (but then again, it still didn't show up all the networks that shows on my phone)
p.s : Hotspot networks always show up in the wifi list, but when I switch the hotspot from using Data to using the WiFi the hotspot phone is connected to it disappears from the list
p.s.s : the tablet is running the latest update available for me (November 2019 / T860XXS1ASK2)
p.s.s.s : tried wiping cache and even hard formatting the device.
p.s.s.s.s : Its the Wifi only variant

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