There are some router/modems that have an issue with Roku devices if the 2.4 GHz radio mode is set to only G/N. Changing the mode to B/G/N restores connectivity. It might be worth a try on yours. I have no idea how it's changed on your router, as I don't have the same type. You might control the router through an app, you might have to log into a config screen on the router, or you might need to contact AT&T and ask them to change it. For my Xfinity modem, Comcast has me locked out of those settings, so I'd have to contact them to make any changes.
My AT&T internet was already set to B/G/N for the 2.4GHz wifi radio status and my TV still won't connect to the wifi. I have factory reset the TV and router.
coynem56 does your TV see your WiFi and just not connect, or is it not even shown in the list?
It sees the wifi and is just not connecting.
You have a Roku TV? Not a TV with a Roku connected?
If so, it should be able to connect on 5 GHz band. What channel is your wireless router using on 5 GHz?
It's a Roku TV and the 5GHz band is N/AC/AX mode
