My 6 month old, 2017 Chevy Bolt Premier, with only 5200 miles on it, developed a rather large crack in the windshield for no apparent reason! It is located right in the center of the windshield. There is a horizontal crack about 4 inches long that then makes a sharp right turn and goes vertically upwards for about 9 inches. No stones, pebbles or other hard objects have hit this windshield in the days prior to this crack mysteriously occurring. It was merely parked in a parking lot at my workplace. This is my commuter car, 45 miles one way, 5 days a week, and it stays parked in company parking lot, 8 hours/day, which has a security guard patrolling at all times and security cameras on parking lot 24x7. At home it stays safe inside a locked garage. So, I'm concluding this crack is most likely "stress fracture" related? During manufacture of the windshield or during assembly at the Lake Orion Michigan GM Plant, who knows? I am going to try my Chevy dealer near my house, in Dublin, CA, with a warranty claim request. If no go, then I will call a private windshield replacement guy. I have owned 7 cars in my life, all purchased brand new. Never had a windshield crack after just 6 months. Not happy right now, since I have just read 3 additional blogs on this forum wherein owners of new 2017 Bolts have developed mysterious cracks in their windshields! From the blogs on here I read that it is apparently very hard to get a replacement windshield for a 2017 Bolt. Why GM Why?!