This sounds like your Roku lost its internet connection.
I've run into this here several times. This has always worked for me to re-establish my net connection when it has been lost:
- Restart your router (even if other devices have no problem finding and connecting). Sometimes that's all it takes, if not keep going.
- Restart the Roku to clear its memory via Settings > System > System restart (for a Roku TV it's Settings > System > Power > System restart). Again sometimes that's all it takes, if not keep going.
- Find and connect to your network via Settings> Network > Set up connection
If that doesn't fix it, try disconnecting the power to your Roku for a few seconds. When it comes back up, see if you then can set up the network connection.
Roku Community Streaming Expert
I am not a Roku employee, only a user like you. Please, no support questions via private message -- post them publicly to the Community where others may benefit as well.
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