2016 Audi Q3 Structure

Owned car for 4 years. Car has a panoramic sunroof in two sections. rear section is glass and does not move. Front section is glass and does actuate. On [XXX]. All was fine. Driving on smooth highway, [XXX (at XXX]. No other vehicles within site behind or in front around me). Sunroof was 100% closed the entire trip. Suddenly my front (moveable segment) of the sunroof literally exploded, raining glass all over me. I maintained control of the vehicle and arrived at work 20 min later. Was able to take photos when the sun came up. No apparent cause. I found no other debris in the car except the glass. No vehicles were around me at the time. Temperature was high 50s that morning. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)