Hi, @BTB.
Welcome, and thanks for posting here in the Roku Community!
We understand that you are experiencing unexpected behavior when trying to use your Bluetooth Headphones to your Soundbar.
Could you please let us know what is the brand and model number of your Soundbar? Also, please provide the latest software version of your Roku Ultra.
We'd be more than willing to help, if you can provide more information.
We are looking forward to your response.
All the best,
Emman
Emmanuel-D.
Roku Community Moderator