Bluetooth: headphones connect, make a noise and shut down

I am trying to connect Sennheisers True Wireless Momentum 2 to a ZBook-Studio-x360-G5 running Ubuntu 20.4. Initially the device connects, then it makes a weird sound (like a video that is hung on a single frame when Windows crashes), the headphones restart, connect again and crash with the same sound again. That goes on in a loop. I have tried reinstalling pulseaudio, killing it, rebooting with no effect. I vaguely remember that I once fixed a similar issue with Momentum1 by changing some config files, but I can't find the solution now. The issue then was caused by the touch controls that the headphones have.

Any help is appreciated!

Below are the log of

sudo systemctl status bluetooth


● bluetooth.service - Bluetooth service
     Loaded: loaded (/lib/systemd/system/bluetooth.service; enabled; vendor preset: enabled)
     Active: active (running) since Tue 2021-06-29 09:10:52 CEST; 3 days ago
       Docs: man:bluetoothd(8)
   Main PID: 792 (bluetoothd)
     Status: "Running"
      Tasks: 1 (limit: 18952)
     Memory: 2.9M
     CGroup: /system.slice/bluetooth.service
             └─792 /usr/lib/bluetooth/bluetoothd

Jul 02 14:19:42 rad-HP-ZBook-Studio-x360-G5 bluetoothd[792]: No reply to Start request
Jul 02 14:19:42 rad-HP-ZBook-Studio-x360-G5 bluetoothd[792]: Unable to get io data for Headset Voice gateway: getpeername: Transport endpoint is not connected (107)
Jul 02 14:19:49 rad-HP-ZBook-Studio-x360-G5 bluetoothd[792]: No reply to Start request
Jul 02 14:19:49 rad-HP-ZBook-Studio-x360-G5 bluetoothd[792]: Unable to get io data for Headset Voice gateway: getpeername: Transport endpoint is not connected (107)
Jul 02 14:27:08 rad-HP-ZBook-Studio-x360-G5 bluetoothd[792]: a2dp-source profile connect failed for 00:1B:66:E2:72:B8: Device or resource busy
Jul 02 14:27:14 rad-HP-ZBook-Studio-x360-G5 bluetoothd[792]: Unable to get io data for Headset Voice gateway: getpeername: Transport endpoint is not connected (107)
Jul 02 14:27:14 rad-HP-ZBook-Studio-x360-G5 bluetoothd[792]: 00:1B:66:E2:72:B8: error updating services: Input/output error (5)
Jul 02 14:27:19 rad-HP-ZBook-Studio-x360-G5 bluetoothd[792]: Unable to get io data for Headset Voice gateway: getpeername: Transport endpoint is not connected (107)
Jul 02 14:27:21 rad-HP-ZBook-Studio-x360-G5 bluetoothd[792]: a2dp-source profile connect failed for 00:1B:66:E2:72:B8: Device or resource busy
Jul 02 14:27:23 rad-HP-ZBook-Studio-x360-G5 bluetoothd[792]: connect error: Device or resource busy (16)
~

and

sudo tail -f /var/log/syslog

Jul  2 14:17:19 rad-HP-ZBook-Studio-x360-G5 bluetoothd[792]: Unable to get io data for Headset Voice gateway: getpeername: Transport endpoint is not connected (107)
Jul  2 14:17:28 rad-HP-ZBook-Studio-x360-G5 gnome-shell[2202]: ../clutter/clutter/clutter-actor.c:10558: The clutter_actor_set_allocation() function can only be called from within the implementation of the ClutterActor::allocate() virtual function.
Jul  2 14:17:58 rad-HP-ZBook-Studio-x360-G5 gnome-shell[2202]: ../clutter/clutter/clutter-actor.c:10558: The clutter_actor_set_allocation() function can only be called from within the implementation of the ClutterActor::allocate() virtual function.
Jul  2 14:18:01 rad-HP-ZBook-Studio-x360-G5 systemd[1]: Starting Load/Save RF Kill Switch Status...
Jul  2 14:18:01 rad-HP-ZBook-Studio-x360-G5 systemd[1]: Started Load/Save RF Kill Switch Status.
Jul  2 14:18:06 rad-HP-ZBook-Studio-x360-G5 systemd[1]: systemd-rfkill.service: Succeeded.
Jul  2 14:18:09 rad-HP-ZBook-Studio-x360-G5 gnome-shell[2202]: ../clutter/clutter/clutter-actor.c:10558: The clutter_actor_set_allocation() function can only be called from within the implementation of the ClutterActor::allocate() virtual function.
Jul  2 14:18:11 rad-HP-ZBook-Studio-x360-G5 systemd[1]: Starting Load/Save RF Kill Switch Status...
Jul  2 14:18:11 rad-HP-ZBook-Studio-x360-G5 systemd[1]: Started Load/Save RF Kill Switch Status.
Jul  2 14:18:16 rad-HP-ZBook-Studio-x360-G5 systemd[1]: systemd-rfkill.service: Succeeded.
Jul  2 14:18:38 rad-HP-ZBook-Studio-x360-G5 gnome-shell[2202]: ../clutter/clutter/clutter-actor.c:10558: The clutter_actor_set_allocation() function can only be called from within the implementation of the ClutterActor::allocate() virtual function.
Jul  2 14:18:42 rad-HP-ZBook-Studio-x360-G5 kernel: [277686.263495] input: MOMENTUM TW 2 (AVRCP) as /devices/virtual/input/input58
Jul  2 14:18:42 rad-HP-ZBook-Studio-x360-G5 gnome-shell[2202]: Window manager warning: Overwriting existing binding of keysym 31 with keysym ffbe (keycode 43).
Jul  2 14:18:42 rad-HP-ZBook-Studio-x360-G5 gnome-shell[2202]: Window manager warning: Overwriting existing binding of keysym 31 with keysym 31 (keycode 43).
Jul  2 14:18:42 rad-HP-ZBook-Studio-x360-G5 gnome-shell[2202]: Window manager warning: Overwriting existing binding of keysym 32 with keysym 32 (keycode 44).
Jul  2 14:18:42 rad-HP-ZBook-Studio-x360-G5 gnome-shell[2202]: Window manager warning: Overwriting existing binding of keysym 33 with keysym 33 (keycode 45).
Jul  2 14:18:42 rad-HP-ZBook-Studio-x360-G5 gnome-shell[2202]: Window manager warning: Overwriting existing binding of keysym 34 with keysym 34 (keycode 46).
Jul  2 14:18:42 rad-HP-ZBook-Studio-x360-G5 gnome-shell[2202]: Window manager warning: Overwriting existing binding of keysym 35 with keysym 35 (keycode 47).
Jul  2 14:18:42 rad-HP-ZBook-Studio-x360-G5 gnome-shell[2202]: Window manager warning: Overwriting existing binding of keysym 38 with keysym 38 (keycode 4a).
Jul  2 14:18:42 rad-HP-ZBook-Studio-x360-G5 gnome-shell[2202]: Window manager warning: Overwriting existing binding of keysym 39 with keysym 39 (keycode 4b).
Jul  2 14:18:42 rad-HP-ZBook-Studio-x360-G5 gnome-shell[2202]: Window manager warning: Overwriting existing binding of keysym 36 with keysym 36 (keycode 48).
Jul  2 14:18:42 rad-HP-ZBook-Studio-x360-G5 gnome-shell[2202]: Window manager warning: Overwriting existing binding of keysym 37 with keysym 37 (keycode 49).
Jul  2 14:18:42 rad-HP-ZBook-Studio-x360-G5 gnome-shell[2202]: Window manager warning: Overwriting existing binding of keysym ffc7 with keysym 30 (keycode 4c).
Jul  2 14:18:47 rad-HP-ZBook-Studio-x360-G5 bluetoothd[792]: Unable to get io data for Headset Voice gateway: getpeername: Transport endpoint is not connected (107)
Jul  2 14:18:47 rad-HP-ZBook-Studio-x360-G5 bluetoothd[792]: No reply to Start request
Jul  2 14:18:47 rad-HP-ZBook-Studio-x360-G5 pulseaudio[789240]: Transport Acquire() failed for transport /org/bluez/hci0/dev_00_1B_66_E2_72_B8/sep2/fd3 (Input/output error)
Jul  2 14:18:47 rad-HP-ZBook-Studio-x360-G5 acpid: input device has been disconnected, fd 31
Jul  2 14:18:50 rad-HP-ZBook-Studio-x360-G5 kernel: [277693.828295] input: MOMENTUM TW 2 (AVRCP) as /devices/virtual/input/input59
Jul  2 14:18:50 rad-HP-ZBook-Studio-x360-G5 gnome-shell[2202]: Window manager warning: Overwriting existing binding of keysym 31 with keysym ffbe (keycode 43).