On four occasions during the past month, my 2005 Crossfire Coupe has refused to start. All of the electricals work, but the engine will not turn over. After 20-30 minutes, the engine starts normally. On two of the four occasions, I have stopped in a parking lot, run into a store and when I came out the engine would not start. On two occasions, the engine has stopped running at low speed and then the engine will not restart. Again, after 20-30 minutes the engine restarts.