I've wondered if driving environment or even driving style might have something to do with it. In particular, since this system works off of the diagonals in the car, I've wondered if angled driveway entrances that load the diagonals of the car could be involved.
I've broken suspension pieces (typically sway bar mounts) in a couple of previous cars due to this kind of loading. This influences my driving style around this kind of transition and may be part of the reason I've not had any DRC problems, yet. My old Taurus SHO and my current M3 both lift a wheel off of the ground in diagonal transitions.