2003 Ford Windstar wipers, windshield & visibility problems

We're writing this letter to inform you of what we see and feel is a flaw in the design of the 2003 ford windstar and a safety hazard. We took our 2003 windstar to the dealership from which we bought it, " prairie ford" located at 601 west roosevelt road, west chicago, illinois 60185 because we were having a problem with the dual sliding passenger doors windows fogging up with or without passengers.

I have roughly a 40 minute drive to work. It was a cold day and drove with the heat on and the roads were fine after a snow the night before, but there was no snow left on the vehicle. I came out at the end of the day to find the rear window missing about six-eight square inches and shards of glass below in the snow. The glass appeared to have been hit from the inside, but I think it exploded from within (nothing else had been broken or missing from the inside). I'd had no trouble with the rear defogger or wiper.