2003 Ford Focus wipers, windshield & visibility problems

After leaving my auto, I returned to find the rear window shattered, but in tact/in place. There no signs of any impact or attempted entry. The police were called and they said they could not find any evidence of anything striking the window and appeared it might be a faulty window. Upon bringing it to the dealer's sevice shop, the manager said he would notify his ford rep of this problem. He said normally they would not do anything but since the auto was so new, he would try to see what he could do.

Dt*: the contact stated the ignition locked up and the vehicle was taken to the dealership. The ignition tumbler was replaced. The ignition locked up again, and the dealership determined the key needed to be replaced because they would not work with the new ignition tumbler. Also, the windshield has been replaced three times. The windshield cracked when hit by an object on the highway and overnight, with the source unknown.