I was driving at approximately 45 mph on m-119 in petoskey michigan. i heard a loud, sharp bang, similar to hearing a rifle being fired without ear defenders. immediately, i pulled to the shoulder to inspect the vehicle and assess damage. the panoramic roof had shattered. there was no sign of impact from external sources. the interior shade was closed. had it been open the glass from the sunshine roof would have fallen into the passenger compartment. this was an unprovoked failure of a key body component.,. *tr