the cars been in the garage all week. not even sat in, let alone driven. i get in it now, and there is a crack in the windsheild. about 6 inches, coming from very bottom of windshield in front of steering wheel, goes up about 3 inches, then curves another 3. what could cause this? it was not there last time i drove it. could it have been a very small crack, too low on the glass to see, and it is spreading?