Rear window shattered- any other known issues?

[H2_in_DE]

The rear window of our 2007 H2 suddenly shattered a few weeks ago while driving. We had the rear heater/defrost on and it was snowing outside so the hot/cold combustion made it blow out. Has anyone else had this problem before? Trying to determine coverage and if its a known Hummer issue or just something random that happened to us. Any help or input would be great! Trying to get it covered. Thanks!