Thank you for posting here in the Roku community, @Dredrhino!
It seems like your Roku TV is experiencing an issue with the volume control, as the volume decreases on its own until it reaches 0 and mutes.
We highly recommend repairing your Roku remote or replacing the remote batteries. After doing so, please perform a system restart. To do this, go to settings, system, and then select power/system restart.
We would recommend trying to see if that resolves your issue. Please keep us posted.
Best regards,
Jharra
Jharra Q.
Roku Community Moderator