I also have this problem. Worked fine for 3 weeks.

I've reset about 20 times. Reset my router also.

The TV can't find any of the multiple wifi networks that every other device I have can find.

Worked fine for 3 weeks, now it just times out when searching. Oddly, if I turn the TV on and quickly go into network setup it finds all the networks but after 2 seconds the screen disappears?

So annoying.