This can happen with tempered glass for no apparent reason. In my courtyard villa in the "middle" of the night a glass slider panel burst and glass in very small pieces flew every where. Luckily my tenant was asleep and not sitting near this side door. The company that replaced the glass from Orlando said this can happen and does without anything hitting it. Just the way tempered glass is. I wouldn't look for a reason, as there may not be one.
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