Dave,
We never had an experience like that with a Motorhome but we did have and unusual experience with our new John Deere Gator recently. Our Gator has a full glass cab with a large windshield, the windshield is hinged for ventilation. I pushed the window closed from the outside and it exploded, it sounded like a shot gun blast with a bright flash, I found glass as far as ten feet away.
We use the gator to travel from one farm to another at speeds in excess of 30 mph. I was thankful it did not happen while traveling down the road but disappointed something like that would happen with a windshield.
Our John Deere dealer said windshields are not covered under warranty, I can understand that but I'm not sure why they would have glass in the windshield that would do that.
We were told that it was most likely a flaw in the glass referred to as an air pocket, perhaps that's what was wrong with your window?
Sorry to hear about your situation that's unfortunate. I thought about opening our Emergency window but because of your post have reconsidered, thank you for sharing what happened.
I'm Dave R as well....
