It would help to know what the model number of your Roku device is displayed under Settings->System->About.
Does it show other networks, but not yours?
The model number is 3930RW-Roku Express
As you may be aware, that's a 2.4GHz-only model. There have been cases of router firmware updates turning off the 2.4GHz band. So I would first check the router and make sure it is broadcasting 2.4GHz and that all modes b/g/n are enabled. (Some rokus seem to have issues with certain routers if they are only in g/n mode.)
Phones and computers usually do 2.4GHz, 5GHz, and maybe 6GHz, but lots of other devices only have 2.4GHz radios.
Thank you for the information. I checked and I probably will need to get a new Roku.
