Had been to BMW workshop couple of times, every time they fix it, it comes back after one week.
First they fixed the tail gate – not solved, then they said it could be the latches n they replaced some parts – not solved, then they removed cargo cover – not solved.
Now I got used to it as the sound is not terrible and its not all the time. Dealer wanted me to have this inspected by BMW service engineer who comes once in a while to the dealer, I felt it waste of time to pursue so I stopped.
Had Honda CRV and MDX before and never had this problem. This is my first BMW and can’t believe 60 K vehicle has such a problem which cannot be fixed But I appreciate my dealer in trying to solve the issue.

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Turbo-Diesel trucker
2010 X5d – Vermillion Red/Saddle Brown|ZCW|386|609|620|6FL|6UH
Ordered 10/20/09 – Production # 10/23/09 – Production Start Date 11/23/09 - Production Completion 12/03/09 - Dealer Received: 12/07/09 - Actual Delivery 12/12/09
2007 Acura MDX (Tech and Ent) – Nimbus Gray Metallic/Black