Really strange one that I’m experiencing. I’ve got a Samsung Tv and Soundbar which randomly, no matter what source I’m watching, will switch to the Soundbar source (hdmi 2 which is earc). It’s really annoying because I have to then manually switch back to the source I was watching. HDMI 2 is not a source in the sources list which you can manually choose. I figured out I can trigger this bug manually by switching the atmos option in the sound settings on the tv.

Now for the weird part, this only happens when my Apple TV is plugged in to the tv, even if it’s not the source I’m watching. If I remove the hdmi connection for the Apple TV, this bug doesn’t happen. Things that I’ve tried,

Factory reset of tv

Turning off match content on Apple TV

Turning of control tv and sound system from Apple TV

Turning off Atmos on Apple TV

Changing HDMI cable and port the Apple TV is plugged into.

Sorry for the long post, I hope it makes sense, I’m a bit at a loss as what to try next. Thanks