Bluetooth problems (again)

Hello,

I am aware that there are several threads treating bluetooth problems, but they don't really describe the problem I have.
I am listening to Spotify in my car by connecting the phone to the car (Audi MMI). I works well, it connected fine and every time I enter that car, the phone and the car automatically pair themselve.
But somtimes I have the problem that the phone stops playing the audio via bluetooth and uses it's own speakers instead. The funny thing is, the bluetooth connection...

Bluetooth problems (again)

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