I am having the same issue with the Roku Soundbar and YouTubeTV.
It is consistently hanging during playback. I ultimately get an error dialog about not having an internet connection. I check the connection and it is good, however, I'm still forced to Restart the device. I have to do this several times a day. The problem never occurs on my other standard Roku device.
This soundbar is connected to my Samsung TV with the optical cable option as it didn't have the type of USB connection required to work without it.