For some reason, if we run the AC. turn the car off, it will not start back up. If we let it sit a few hours, it will start back up. Turn it off, and it will not start again. It just cranks, and cranks, but does not start. This has happen 4 times since I purchase the car. The first time, I took it to the dealer, and they replaced the battery, and a main relay. The second time, the dealer stated I needed a tune-up. I've had a tune-up, and had the injectors cleaned, and today after my wife turned on the AC, ran to the store, came out, and it wouldn't start. Do anyone have any ideas on what the problem may be.