Before I start poking around in this machine and attempting to clean something that creates more of an issue thought I would ask for advice. Got this machine about 6 months ago, starts up, plays, never got past the "8 hole". Finally got to number 9, got it in successfully but the game registered "Game Over" on me instead of allowing me to go for #10. Any ideas on why that happened and what I should be looking for. Possible a dirty sensor? Any advice would be greatly appreciated. Thanks