Just happened to my Models S. I picked up my car from the body shop where it's been for a month. When I got home I discovered a crack was forming on the back glass. Since Friday, it's been running and has tripled in size. I'm sure the body shop has insurance, but I fear they may try to duck responsibility. I imagine State Farm will have an issue with that if they do and I'm just going to let them duke it out. Hopefully this isn't a prolonged process...