Same with Bose soundbar 500.
Before last update I could select it in the "default audio output" list and that way it auto connected whenever I turn the tv on.
Now I have to connect it manually every time trough either Bose app or settings in the AppleTv menu.
And even then it auto-disconnects if for some reason I don't have anything playing for a while.
Zarebr
Users receive reputation points by contributing quality content to the forums.
Posts include post and replies published on the forums.
Post authors can mark replies as Accepted to indicate successful solutions.
Apple Developer Forums admins can mark replies as Apple Recommended to indicate an approved solution