I received my TESLA model S on December the 8th, 2012 in Houston, TX. I noticed a spontaneous crack on the windshield (without any stone chips) 2 weeks ago. When I contacted the TESLA service, they said that it has apparently happened to other cars as well and it is likely due to some increased stress in the structural aluminum frame of the body which makes the windshield crack. I have yet to have the glass fixed and waiting (for the last 2 weeks)for TESLA service manager to call back to fix it. But the more important problem is that simply replacing the glass would not solve the cause of the problem. It is imperative that the structural fault needs to be addressed as well, to avoid it to be a recurring problem. I wonder if anybody else has experienced this.