[Benjjman007]

I think this is what he is talking about and I have the same problem in my M3 and in my old 335.

-You are on a call in the BMW via bluetooth.
-You park and turn off the car, heck even push the button twice, and if you dont have CA, take the key out
-You switch the audio source to "iPhone"
-The call sound goes to the iPhone, but the counter in the Nav display continues and if you were listening to anything from an audio source before the call, that sound will now takeover.
-You exit the BMW, talking on your phone(holding to head) and lock the car.
-The audio source or sound can still be heard with the doors closed. or if the audio source had been muted you can still see counter on the display.
-There is no "goodbye" BMW screen that we are use 2.

Is this correct? Because This is the issue that I face as well, and have confirmed on at least 5 different E90's with iDrive/Nav.