That was one of the many minor items that I had to sort out on my early build 2013. Dealer replaced a couple of parts in the right rear door. It helped, but the soft close on that particular door remains finicky. I have read on here of some other owners with same problem on the right rear door. Not sure that replacing parts will provide a solid fix. I think that it might actually be something other than a mechanical problem like maybe an issue with the retained power software. It seems to especially show itself if that door is left open then closed after the retained power electronics go to sleep. Kind of weird.