I had a small bug creep into my Williams Getaway this week, when I got to multiball mode the CPU would crash and re boot (switch off and power up).
I trobleshooted it tonight and went over every connector, unplugged and re seated them including the ribbon cables. Now when I get back to multiball mode the game does not crash anymore
Unplugging and reseating the connectors cleans the pins and deters bugs from creeping in to the game.