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Had same on a city golf. Seems to be temp differences causing it. Or as a secondary theory someone with a weedeater kicked up a piece of gravel.
What causes the windows to break on it's own?
Spontaneous glass breakage is a phenomenon by which toughened glass (or tempered) may spontaneously break without any apparent reason. The most common causes are:
• Minor damage during installation such as nicked or chipped edges later developing into larger breaks normally radiating from point of defect.
• Binding of the glass in the frame, causing stresses to develop as the glass expands and contracts due to thermal changes or deflects due to wind
• Internal defects within the glass such as nickel sulfide inclusions
• Thermal stresses in the glass
• Inadequate glass thickness to resist wind load
I remember this being an issue on the Corsa Lite when the rear window demister was in use.
On the Corsa it was a latent defect. In your case it was bad luck as per the wiki.
Wonder if this could happen to bulletproof glass.