Tracked it further down (ubuntu 16.04).

On a fresh boot
- bluetooth device connects, with sound enabled (I configured bluetooth to 
default to bluetooth sound device on connect)
- video playback does not stop
- Sound is played perfectly fine.

After a suspend to ram and suspend
- bluetooth connects, but sound is not enabled
- video playback stops
- Workaround: I have to switch from A2DP to HSP/HFP and back to A2DP.
- After applying the workaround (manually, every time), video playback 
continues, sound plays fine via BT.

I've just updated to HWE kernel 4.8.0-36-generic. But that did not
change anything, compared to 4.4 kernel.

To sum up: It's related to suspend/resume, at least sometimes. And
Kernel 4.8 does not fix it.

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https://bugs.launchpad.net/bugs/1589008

Title:
  Bluetooth freezing video playback In Ubuntu/Kubuntu 16.04

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