Hey, I have a Super Pro Decathlon cart that has an odd problem. At first the game plays fine but when I get to the javelin event, the screen goes crazy and flickers really fast. When I start running it goes away but comes back if I stop. It goes away entirely when I throw though. Same problem occurs whether its in practice mode or not. Any idea what the problem is? I cleaned the contacts but it did not help. I'm guessing it's a bad cart but why would only that one event be screwy? Any help is appreciated, Thanks.