My Bose QuietComfort 35 bluetooth headphones disconnect after a few seconds in Ubuntu 17.10.
They used to work fine under Ubuntu 16.04. After a restart, the same thing happens again. I can not reconnect the headphones without restarting.
I tried to use the solutions for the pairing problem (Pair Bose QuietComfort 35 with Ubuntu over Bluetooth), but the problem persists. Also, as far as I have seen the other questions concerning these headphones, this seems to be a different problem.
This is the result for the service bluetooth status after the phones disconnect:
● bluetooth.service - Bluetooth service
Loaded: loaded (/lib/systemd/system/bluetooth.service; enabled; vendor preset: enabled)
Active: active (running) since Sat 2017-12-09 22:34:21 CET; 1min 58s ago
Docs: man:bluetoothd(8)
Main PID: 742 (bluetoothd)
Status: "Running"
Tasks: 1 (limit: 4915)
CGroup: /system.slice/bluetooth.service
└─742 /usr/lib/bluetooth/bluetoothd
Dez 09 22:34:21 mycomputer systemd[1]: Starting Bluetooth service...
Dez 09 22:34:21 mycomputer bluetoothd[742]: Bluetooth daemon 5.46
Dez 09 22:34:21 mycomputer systemd[1]: Started Bluetooth service.
Dez 09 22:34:21 mycomputer bluetoothd[742]: Starting SDP server
Dez 09 22:34:21 mycomputer bluetoothd[742]: Bluetooth management interface 1.14 initialized
Dez 09 22:34:30 mycomputer bluetoothd[742]: Endpoint registered: sender=:1.77 path=/MediaEndpoint/A2DPSource
Dez 09 22:34:30 mycomputer bluetoothd[742]: Endpoint registered: sender=:1.77 path=/MediaEndpoint/A2DPSink
Dez 09 22:35:08 mycomputer bluetoothd[742]: /org/bluez/hci0/dev_04_52_C7_31_07_DE/fd0: fd(37) ready
Dez 09 22:35:54 mycomputer bluetoothd[742]: Start: Connection timed out (110)
Dez 09 22:35:56 mycomputer bluetoothd[742]: Abort: Connection timed out (110)
Best Answer
What helps for me (Ubuntu 18.04) is do remove the device in the Bluetooth settings and then reconnect. After that, the connection is stable.