I have a friend that has a sky shark and sometimes when playing the game it will freeze up but if you turn the power off and then back on everything is fine. What could possibly be the problem? Loose connection somewhere?
Power supply problems. Voltage slightly too high or too low.
Measure the voltage at the edge connector of the gameboard now and see what it is now. You're only concerned with the +5 volts reading.
Years ago we had some that locked up on the route. I seem to recall some sort of service bulletin about this. I think it said this game likes to be running at between 5.05 to 5.15 volts.