In ProStreet, when I use the "A" button to accelerate the car, the car doesn't move. Sometime switching the unit off/on helps, but the success rate is about 1 in 10. My initial suspicion was the hardware, which we bought in Dec/07. But when I switched the game cartridge to another unit, which too was purchased in Dec/07, it exhibited the same problem as well. Has anyone faced similar issues? Thanks.