I have a miprom 21 that I keep getting a 60 fault on. I have replaced MSU board card rack and power supply. Problem is intermit and happens twice a day so times 3. Car will come to a floor start to open doors and then closes them before it can full open. It's at this point that I lose the P I and car gets 60 fault. It will reset a few times then goes down with retry error. Any help would be greatly appreciated