Hello,
I'll begin with some information that's relevant to the problem. I bought my android tv (a Hitachi) about 3/4 weeks ago. everything worked, connected to my wifi, etc etc.
Went on vacation for a week and came home today, TV was disconnected from the Wifi. It still appeared as available, but when trying to connect it, it would say "wifi network not found". I forgot the connection and set it up again, but got the same result. Unplugged and plugged the router, still same result. After that, just turned off my tv's WiFi and back on, and now it can't find any wifi. not mine, but it doesn't show my neighbor's wifi connections either.
Reset the router but nothing happened. Does anyone know what to do? can't do anything on it now since almost every app requires an internet connection :/
If you're wifi is 5GHz, try connecting to 2.4GHz to see if that works. There was an issue with the Chromecast with GTV that caused certain channels on 5GHz to not work - I believe that is corrected now, but perhaps could be same for you. The temp fix for the CCwGTV was to lock the wifi to a channel (I think Channel 20 worked)