In early February the rear window of my t reg polo unexpectedly shattered whist waiting at traffic lights. On Friday the window did exactly the same thing driving through my local village. I'm pretty sure nothing hit the window. The car has been in the family since new so it's not been in any accidents. The boot doesn't appear to be twisted or warped. The heater was on both times but from my understanding the 12V supply couldn't produce the power required to heat the window to shatter. It was frosty the first time the window shattered but it wasn't very cold on Friday ~10c. I don't want to replace for it to shatter again, any ideas?
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