Bluetooth headset button stopped working

[attah]

Already reported several times.
This looks like the primary one:

[4.4.0] mpris-proxy service crashing and not restarting

REPRODUCIBILITY: 100% BUILD ID = OS VERSION: 4.3.0.12 and 4.4.0.64 HARDWARE: X10II and X10III UI LANGUAGE: Finnish REGRESSION: Yes, worked in 4.2.0.21 DESCRIPTION: mpris-proxy isn’t running by default. This leads into Bluetooth headset play/pause/prev/next buttons not working. PRECONDITIONS: Deezer installed (Spotify should do, too) and a suitable Bluetooth device connected. STEPS TO REPRODUCE: Start the music on the player Click play/pause EXPECTED RESULT: Music stops ACTUAL RES…