My ROKU Soundbar say "Please keep your device plugged in until we finish updating, this may take a bit"
Thanks for the post.
Have you tried performing a factory reset on your Roku Soundbar and setting it up again to see if you are experiencing the same issue?
For more information about how to perform a factory reset, visit our Support page here: How do I factory reset my Roku® streaming device?
Please keep us posted what you find out.