large bang on roof

[ZSHO]

Any members experience this,while waiting for red light to change during winter heard a large bang sound coming from roof area,this happenes twice.i was pissed off thought a rock or something hit the roof,went home to inspect the car could not find nothing wrong,very strange.

[crash712us]

Metal on roof probably relaxing rapidly do temperature change.


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[BiGMaC]

Crash is likely correct...
However, if you have a moon roof you should check all functions though... at a time when it's not going to rain or freeze. 
I have not had the issue in my SHO.... but in my previous ride, an F150, I had it twice and both times it was cracking and failure of the rails for the glass preventing it from closing.