That one reply is worthless, but according to a checking site I use it wasn't AI written.
The first thing to investigate if a WiFi was working well but suddenly stops connecting is if your ISP has control of your router/modem. If you are leasing your router/modem from your Internet provider, they very likely do have control of it, and they probably changed something that impacts your use.
Does your Roku still see your WiFi, but not connect, or does your WiFi not even appear in the list of possible connections? If you can see it, that means they didn't change the channel on you. If you can't see it, then it was probably a channel change. Roku devices on 2.4 GHz can only see channels 1-11. There are channels 12, 13 and 14 that your router might change to but Roku doesn't support them. So confirm the channel is set to 1, 6 or 11 (the three channels that don't overlap each other. If your Roku is dual band, there are also channel restrictions on 5 GHz as well. The channel has to be 48 or lower, or 149 or higher.
If your Roku sees the WiFi but won't connect, then perhaps your ISP changed your 2.4 GHz radio mode to G/N. For some unknown reason some Roku devices have problems with that mode on some modems/routers. Change the mode to B/G/N and you should be able to connect again.
Dan
Roku Community Streaming Expert
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