[Q] Problems connecting to Wifi - Galaxy S III Q&A, Help & Troubleshooting

Hi All,
I've been having a few issues on my S3 with connecting to any wifi network for a while now. I've tried 3 different ROM's (Samsung JB, CM10, Codename Android) and countless modems (currently back on BULG2 all with no change in behaviour). I've also been messing with the build.prop but have restored to stock again (see below).
The issue is when I go to connect to any wifi, I see it on the list, press it then it instantly loses all but one bar of wifi signal and sits there saying "Connecting..." then flickers back to the "Secured with WPA/WPA2 (WPS available)" screen and retrys... This goes on in a loop.
Any ideas how I can fix this? I've exhausted my ideas and Google...
Many Thanks - Trev
build.prop:
Code:
# begin build properties
# autogenerated by buildinfo.sh
ro.build.id=JRO03C
ro.build.display.id=JRO03C.I9300XXDLI5
ro.build.version.incremental=I9300XXDLI5
ro.build.version.sdk=16
ro.build.version.codename=REL
ro.build.version.release=4.1.1
ro.build.date=Sun Sep 9 02:02:52 KST 2012
ro.build.date.utc=1347123772
ro.build.type=user
ro.build.user=se.infra
ro.build.host=SEP-67
ro.build.tags=release-keys
ro.product.model=GT-I9300
ro.product.brand=samsung
ro.product.name=m0xx
ro.product.device=m0
ro.product.board=smdk4x12
ro.product.cpu.abi=armeabi-v7a
ro.product.cpu.abi2=armeabi
ro.product_ship=true
ro.product.manufacturer=samsung
ro.product.locale.language=en
ro.product.locale.region=GB
ro.wifi.channels=13
ro.board.platform=exynos4
# ro.build.product is obsolete; use ro.product.device
ro.build.product=m0
# Do not try to parse ro.build.description or .fingerprint
ro.build.description=m0xx-user 4.1.1 JRO03C I9300XXDLI5 release-keys
ro.build.fingerprint=samsung/m0xx/m0:4.1.1/JRO03C/I9300XXDLI5:user/release-keys
ro.build.characteristics=default
# Samsung Specific Properties
ro.build.PDA=I9300XXDLI5
ro.build.hidden_ver=I9300XXDLI5
ro.build.changelist=142414
# end build properties
#
# system.prop for smdk4x12
#
rild.libpath=/system/lib/libsec-ril.so
rild.libargs=-d /dev/ttyS0
ro.sf.lcd_density=320
ro.lcd_min_brightness=20
ro.kernel.qemu=0
ro.tvout.enable=true
persist.sys.storage_preload=1
net.streaming.rtsp.uaprof=http://wap.samsungmobile.com/uaprof/
# Multimedia property for Smart View
media.enable-commonsource=true
#
# ADDITIONAL_BUILD_PROPERTIES
#
ro.opengles.version=131072
debug.hwui.render_dirty_regions=false
ro.sf.lcd_density=320
ro.error.receiver.default=com.samsung.receiver.error
dalvik.vm.heapstartsize=8m
dalvik.vm.heapgrowthlimit=64m
dalvik.vm.heapsize=256m
ro.hdcp2.rx=tz
ro.secwvk=220
ro.sec.fle.encryption=true
ro.config.ringtone=S_Over_the_horizon.ogg
ro.config.notification_sound=S_Whistle.ogg
ro.config.alarm_alert=Walk_in_the_forest.ogg
ro.config.media_sound=Media_preview_Touch_the_light.ogg
keyguard.no_require_sim=true
ro.com.android.dateformat=MM-dd-yyyy
ro.carrier=unknown
ro.com.google.clientidbase=android-samsung
ro.ril.hsxpa=1
ro.ril.gprsclass=10
ro.adb.qemud=1
ro.com.google.apphider=off
ro.com.google.gmsversion=4.1_r2
dalvik.vm.dexopt-flags=m=y
net.bt.name=Android
dalvik.vm.stack-trace-file=/data/anr/traces.txt

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Flash back to stock ICS via Odin and then reflash CM10 etc I had this problem and it worked for me
The stock ICS out of the box is LG8
And for future reference, never edit build.prop, That only makes more problems
Sent from my GT-I9300 using xda premium

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Thanks - I was dreading that answer but I reverted to stock and re-upgraded to Codename, all working rather nicely now. I'll leave the build.prop alone now, I was just having a play to see how much trouble I could get in )
Cheers - Trev

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trevburley said:
Thanks - I was dreading that answer but I reverted to stock and re-upgraded to Codename, all working rather nicely now. I'll leave the build.prop alone now, I was just having a play to see how much trouble I could get in )
Cheers - Trev
Click to expand...
Click to collapse
Lol no worries mate, happy to help
Sent from my GT-I9300 using xda premium