I have a similar issue.
Have 3 Roku Soundbars.
2 are Streambars and 1 is the Smart Soundbar.
Internet provider (Bridgenet) did some maintenance, their network went down for 15 hours before they fixed their issue. Now the Smart Soundbar remote won't work. Bar works as I get sound from Satellite, but can't get to settings or anything on the Roku.
I know it's not the Router as everything else connects just fine and the 2 Streambars are having no issues. It's just the Smart Soundbar.
Do I just need to factory reset and start all over? Or is there another way to get in there?