Driving down road going about 46-50 mph at about 6:45pm tonight and the car suddenly slammed on brakes. Brakes locked, but thank goodness car behind me wasnt following close. My head/neck was jerked hard enough to cause headache and terrible soreness. I am very shaken. Came home and told my husband, took ibuprofen for my headache. He googled the problem, found this website. We are very concerned, since we own 2 Teslas and it seems people have the same complaints on both models we own.