I have 2 Roku expresses and suddenly neither will connect to my internet. I have restarted my Xfinity/Comcast modem 3 times and checked the speeds and it is working through my computer and phone just fine, but they refuse to connect. I have restarted the Roku devices and have also tried reconnecting them and have done mostly everything short of factory resets.
XFinity recently made some changes to their modem/router/gateway firmware/configuration.
Try either using the XFinity app or manually configuring your modem/router/gateway's 2.4Ghz SSID to use "B/G/N" mode (not just "G/N" mode).
How do I even do that?
You get the XFinity app (for your phone/tablet) and make the change.
Or you access the modem/router/gateway's configuration pages (usually http://192.168.0.1 or similar).
Or you call Comcast/XFinity support and they do it for you.
Mine 3 are doing the same as of this morning what did you do to get them to work again?
Haven't replied to these, but what I did was get ahold of Comcast who is my provider and he had me go in under admin. If you go 10.0.0.1 and admin will be your user and you will have to make up a password. Go on the left under connection, wi-fi, edit, mode on the 2.4 ghrtz if I remember right and you can go in and change your internet settings to B/G/N and it seems to have worked for me. I also have Fire TV and Android Tv as well and they had some minor issues hooking up as well and the Rokus and them seem to be better now.