LG G2 WiFi Issues

So, suddenly my WiFi doesnt work. Either says "Authentication problem" or connects but doesnt download anything.
Tried it on several networks with the same result.

I've done a factory reset, flashed lollipop same result. Flashed kitkat again, and same thing. Also put CM 12.1 as a last resort and still no luck.
So am I right in concluding that it is a hardware issue? Or is there anything else I could try? :)

Thanks in advance!