Hi, @YoBob,
Welcome to the Roku Community!
Thank you for bringing this issue to our attention. We understand that the Roku audio Streambar or Soundbar is not turning off when the sleep timer on your TV is activated. We're here to assist you.
To better understand your situation, could you please clarify which port the Roku Streambar is connected to on your TV? Is it plugged into the HDMI (ARC) port?
Thank you for your cooperation!
Best,
Jharra
Jharra Q.
Roku Community Moderator