We have a CV in our club and it has been a PITA sometimes by locking multiple coils on at start and other random stuff going on. Eventually we reseated the ASIC (large square IC on the CPU-board) and it has been working ever since. Also, some ribbon cables might need to be replaced, reseating them doesn't always help. The sockets in the header has lost its contact pressure and/or its plating.
My first test would be to change the ribbon cables with another game or new cables.