Oh, just now (after a few minutes) the speaker (with quiet music) has switched itself off again. When I turn up the volume on the player, the sound comes back. That is totally bad. I'm still testing with another player. If that doesn't work, I'll have to return the speaker as a warranty claim. Maybe my device is an assembly model?

Automatic switch-off via Bose Connect works perfectly for me. I have two of these speakers and have never had a problem with this.

Hello Ueli
I actually always listen via Spotify and have never had this problem. It has also never occurred with audiobooks.
Lg
Lutz Marthaler