Thanks for the post.
Can you please specify the issue you are experiencing? What are the steps to reproduce the issue? Are you trying to change the volume of the Streambar or with the TV? Have you tried using another HDMI cable to see if that helps?
For troubleshooting purposes, have you tried connecting this specific Streambar to another TV to see if you are experiencing the same issues?
With more detailed information, we will be able to assist you further.
Roku Community Moderator