030 board continued
I/O would be my first check. Especially since the board started
working again in machine #1 for a time. I'd swap and/or replace my
8520 chips. After that I'd look at power. Remove ALL of the other
boards in the system and see if the failures continue. It would also
be advised to purchase some contact spray from your local electronics
store and clean out the motherboard, if this has not been done
recently. It only takes one sliver of metal to short out a section
and create all sorts of wierd problems.