Can you please provide more information about the issue you are experiencing? Are you playing content through the Roku Soundbar, or through the TV? How are you connected to the TV? Is this issue happening on a specific channel or does it happen regardless the channel you are watching?
With more information we will be able to assist you further.
The Soundbar is connected to the TV via an HDMI cable.
Watching DVDs is especially bad. The DVD player is connected to the TV with RCA cables, and the audio is played through the Soundbar (which is connected to the TV with an HDMI cable).
The sound is also not very good when streaming through the Soundbar (Netflix, Youtube, etc). But I haven't watched these on the TV in awhile, so I'd have to test it to get you a good answer on how these sound compared to the DVD player.
The sound issue doesn't seem to be channel related.