Engine Belts And Pulleys problems of the 2006 Chevrolet Aveo

After pulling into a parking space, my 06 chevy Aveo's engine shut off and I started rolling backwards out of my parking space. I had to press hard on my brakes to stop me from rolling. I had to remove my key and start my engine again. I was still in drive when my engine died and everything in my car was still on ie radio and lights. There is no reason that my automatic car should be rolling backwards while still in drive. Took it to the dealership and they said my comp was running a throttle body repair. Since that would be the third throttle body in nine month, the dealer decided to contact gm and look into it. Throttle body checked out fine, and gm told dealership to run more diagnostics and put miles on my car. After a whole week, the best the dealership could tell me was that they had no idea what was wrong with my car and gm didn't know either. They said if it was replicated again, to have it towed and not to turn the car back on. An 06 with only 50,000 miles on it should not have these kinds of problems. In only nine months of owning my car I have had two throttle bodies, a new head, a new timing belt, and a new brake light switch. I will never buy this car again. Now I have to wait until this car dies again and causes me to get into an accident before I can do anything about it. I am extremely displeased with gm.