I was driving on a state highway with open fields on both sides. There were no other cars or trucks on the road. Clear blue sky and the temperature was about 50 degrees. No windows were open in the car. I was on cruise control at 62 mph. There was what I can only describe as an explosion sound something close to the sound of a 45acp pistol discharge.. luckily I had the sun screen closed or I would have had glass everywhere. The front sunroof had exploded and there was a 18" hole in the middle of it. The force of the break went up, meaning the edge of the broken glass was raised about an inch and a half above the rest of the glass and window frame. That kind of a break is caused by stress not from something like a stone hitting it.. the car was purchased in August so the car is only 4 months old. I immediately drove the car to bergstrom motors in green bay, Wisconsin, for them to fix it. They took pictures. Service managers name is [xxx]. he has all the information. There is no police report. [xxx] got back with me today, December 10, 2020, and told me Buick would not pay for the repairs because it's glass. I was told the repair would be about $1000. Information redacted pursuant to the Freedom Of Information Act (FOIA), 5 U.S.C. 552(B)(6).

- Baileys Harbor, WI, USA