[AC Question]

I'm having problems with turning Wifi on with my Galaxy S3, when i pull down the bar from the top and push the Wifi button, it switches from the grey to the darkened green state for 3-4 seconds, but then reverts to grey instead of going fully green. I'm not sure what caused this to happen but I've tried a number of things to resolve it without success so far:
- I've turned the phone off and on again, including removing the battery.
- I've completely backed up the phone and done a factory reset using the menus.
- I've tried a factory reset after booting through the Volume-Home-Power method.
- I've wiped the cache partition after booting through the Volume-Home-Power method.
- I've tried turning on and off again Flight mode.

I'm not sure what else to try. The phone is running Android 4.3, I haven't rooted it in any way.

Please let me know if there are any other suggestions, I'm willing to try things. I'd like to revert to 4.2 Android but I understand this isn't easy to do.

Thanks