When i came outside the glass was broken and had been thrown to the outside of the vehicle. the vehicle had been driven the day before and was fine. it was parked in the shade and away from anything which could have hit it. it was locked and not touched in any way. the broken fragments were on the ground below the glass frame area. it is the same type of glass that i saw in the story on the news yesterday about the sun roofs that break. when i saw the story i knew this had to be the explanation. i have a picture and the text i sent that day because i was so shocked at how something like this could happen, it made no sense. now it makes perfect sense.