Mine does too. Especially when the voice mail lady voice comes on.
Pressing on the grill makes it go away.
BMW is replacing the grill next week? So hopefully that helps. But right now, with the grill off, there are still frequencies I can hear something rattling in the door.
Frustrating to say the least
09 Space Gray E90 M3 DCT: BPM (Stage 1, DCT and Servotronic) tune, Gintani Sport Exhaust, Dinan Intake