Rear panel on sunroof suddenly shattered while driving on the hwy near Banff, AB enroute to the coast. Sunroof closed, divided hwy, no vehicles in front within at least a couple hundred yards so wasn't a stone or any debris kicked up high and coming down on it. Tempered glass and the thing basically exploded leaving a double fisted size hole in the shattered panel. Good thing the headliner shade was closed as well or glass would have been all over the place. Anyone else have their sunroof spontaneously shatter?