Connection to Bluetooth audio device unstable (speaker drops due to Ubuntu 17.10)

I have a UE Boom 2 Speaker. With Ubuntu 16.04 I was never really able to connect to it via Bluetooth (sound was awful), but when I fresh installed Ubuntu 17.10 beta (one month before release), I was able to connect easily with good sound quality.

But a few days after the official release of Ubuntu 17.10, the Bluetooth connection crashed, and I was not able to connect again, unless I reset the speaker and rebooted my computer. Then I would be able to connect again, but after a few minutes, it would break again.

The default Bluetooth settings window freezes when I am trying to reconnect.

What could be the cause? Unfortunately, I don't know which logs I check to diagnose the problem - please comment if you can advise and I will add any necessary information.

I have tried with another Bluetooth device (from another brand: D-LINK), and I have the same problem.

I am using a ThinkPad T460s (which comes with Bluetooth 4.1).

maybe it will help you - it helped me:

sudo alsa force-reload

and then:

sudo reboot