This happens on my G30 as well. It is due to the iDrive 7 HU waking up fully whenever the car wakes up. Once it wakes up it then connects to Spotify so its ready if you were getting into the car and etc.
The problem is, of course, Spotify only allows one active stream at a time so it pulls it away from your other device...
Spotify will do the same thing if you open it on another device while listening on another...
Spotify should probably add a setting to let you hit a button to temporarily disable this feature and keep you locked to the device you pick.
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