My Father has a 2014 Transit Connect that has the most annoying, non-stop clunking coming from the rear end. What has been done? The tailgate glass has been replaced twice from spontaneously shattering while parked in his driveway on two separate occasions now. What have I inspected? I have checked the jack's mounting location. I have lowered the spare tire and checked to make sure that it is secure. I have disassembled the tail gate twice now to check for a loose lock actuator or windshie