I have a Nexus 5 and have used an S4 and HTC One with no problems like this whatsoever. Gingerbread and Droid 3 are ancient in Android years, sadly. There were Bluetooth issues back then too.
Honestly, the dealer won't know how to do anything except try updating the iDrive software. And if you've already done that I would'nt get my hopes up.
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