I just acquired a Frankenstein and it resets on multiball. Basically you can start a 2 ball multiball and when you progress to the 5 or 6 ball multiball as soon as the the 3rd ball comes into play it resets. I tested 5.06 volts at power supply and 4.96 on cpu. Do I have a corrupted game rom or something of that sort?

Update. Thanks for everyone’s help? I’m posting in case someone else runs into the same issue. The shooter lane switch had the wires soldered on the wrong side of the diode. When ball was in shooter lane if you hit right flipper the game would reset. I switched wire and everything is working so far. I’ll update if problem returns.