If it's not seeing your Wi-Fi network it's possible your router is configured for a channel that isn't supported or it's set to "Auto" and it automatically switched to an unsupported channel. For 2.4GHz networks only channels from 1 to 11 are supported and on 5GHz channels 48 and below or 149 and above are supported.
Roku Community Streaming Expert
Help others find this answer and click "Accept as Solution." If you appreciate my answer, maybe give me a Kudo.