What happened was, I wasn't able to use the Internet. Just wasn't working. And every 20 seconds or so it would flash up at the bottom of the screen "connected to (my router)".
So I turned wifi off and on, which usually fixed connection issues, but didn't help. I also restarted router, even though my computer and my phone isn't having any issues.
So then I went to the wifi settings screen to see if there was any way to reset networks. What I saw was this:
If i turn wifi toggle on and watch the screen, it would scan for networks, find the list... Couple seconds pass... Then the toggle would switch itself off and back on! And then it would start looking and finding networks again, and then off and on, and etc etc.
I have tried a factory reset and cache reset.
I have also downloaded the 4.4.2 stock rom and installed using odin for a totally new install.
Still does it.
Any suggestions? Seems very strange. It's under warranty but it seems like an odd hardware fault, seems more like software but I dunno.
Help me xda, you're my only hope.