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The easiest thing to test would be to see if you can get a new Tune2Air and see if it does the same thing. You can also check your USB port and see if it looks dirty or any contacts look damaged.
I would suspect it might just be your USB in the dash is damaged if the Tune2 Air itself isn't defective.
If it was a connection issue with the phone and Tune2Air you'd lose the audio source but I don't believe your iDrive would switch sources.
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