2022 RS. When you open any passenger door there is a noise from the rear of the vehicle. It is like a loud buzz or humming noise that lasts about 5 seconds or more. Now this only happens after the vehicle has sat for at least about an hour. In other words it happens immediately. But if you then close the door and open it again it does not happen. You try it again after about 30 or 45 minutes it does not happen. Only after it has sat for over about an hour. It is quite loud. Is this a problem? As it comes from the rear, not the engine compartment that makes it even more unusual.