Has happened to me a few times when the battery was disconnected or replaced. Get in the car, push the memory seat #1 button which previously had my presets. Then the seat moves up and forward and literally crushes your chest to the steering wheel. It's quite bizarre and I am sure there is some button to hit to stop it. But it is such a surprise when it happens, and it happens fast. When it stops moving I am absolutely wedged in until I move the seat. I may have a few extra pounds but anyone of normal stature would get wedged in when it happens. It's pretty crazy.