Try this
I had a simular problem on my 335i,
What I did was: Delete the phone on iDrive, delete the BMW connection on your blackberry, Restart both car and phone (blackberry: full battery pull restart) Connect both all over again. That fixed the problem for me, try it and let me know if it helps.
If it doesnt, delete the blackberry from your iDrive and connect a different blackberry if this problem is still there you know its the iDrive if its not its your blackberry.
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