Could the windshield wiper electrical defect cause the windshield to crack?

What is your question?

I rented a Camry with no apparent windshield problem other than perhaps a small chip or crack in the shaded area where the rear view mirror is attached. Nothing seemed amiss, but during the next week, a large crack progressed across the windshield, although there was no known impact or anything to it. The weather was very hot, but this seems ridiculous. IDK whether it's a factory defect due to the wiper issue, the glass, or the attachment spot of the rear view mirror. All I know is they are trying to stick me with a bill of over $500, and I did nothing. Very freaky. Any ideas on this one?