Yalbader

So two days ago while driving the car, i noticed some vibration when down shifting from 3rd to 2nd gear and its quite clear. I took the car to the dealer immediately. Just got a call from them saying that this a known issue by Porsche and has already been fixed on 3 other cayennes before i brought mine.
They say its something to do with exhaust clamps, but he cant answer me why its only between 3rd and 3nd.

Anyone faced this issue yet?