My 2019 CX-9 does something troubling. Twice now when I have been parked, with the vehicle in drive and my foot on the brake, the vehicle starts bucking or chucking. The first time it happened the person in the car next to me could see it bouncing from outside the vehicle. I have had it to the dealer twice as it is still under warranty but so far they haven't been able to recreate the problem. Was wondering if anybody else has had this happen to them and, if so, what was causing it. I would appreciate any and all input.