Same here. I use Logitech BT Adapter that is connected to my amplituner.
Got the same BT Adapter.
Im trying with the external bluetooth and still got the same problem.
How should I configure the system to be sure the bluetooth that im using is dongle not internal? 
I had the same issue, tried the suggested workarounds - no success,
I tried the following: setting the "Keep Audio Alive" to "10 minutes" in "System"--> "Settings" --> "Audio..." Don´t set it to "Always", doesn´t work, tried it.
Now I can listen for an extended period of time... still waiting for the drop out... fingers crossed.
Hope that helps, as this Pi 3 is a nice system and crappy bluetooth hardware would be very stupid.
Does it work correct now?
Kaois are You still fighting with the raspberry bluetooth or working on a dongle?
I have ordered a bluetooth dongle will check it out.
Got this same problem, did anyone solve this problem?
When on HDMI and Analoge sound everything works perfect, problem only with bluetooth sound. After the bluetooth sound did disappear it also does not work on hdmi or analogue.
Have to restart my rapsberry.
Same issue with 7.95.2I believe vpeter is looking at this.
I'll do a clean install of 7.95.2 and see if this eliminate the problem.
Got this same problem, did anyone find a sollution?
