First I seriously doubt all boards are NEW. Repaired is more likely. You may have inherited someone's problem in a repaired board especially if it runs for 2 hours then shuts down. The 5v should really be set at 5.2v on DTL & TTL logic. I doubt the .2 is your problem unless there is building supply voltage problems. Did you keep all your old boards? Try to never send them back until you have a running car.
