MVP Baseball on my Sony PSP keeps freezing?

I play MVP Baseball for my Sony PSP. I've tried two different umd disks of the same game. When the other team does a substitute a box pops up informing you of the substitution. 90% of the time the game freezes and I have to restart all over again. should I clean the lens or should I call the technical support center for sony? I can't seem to find my manual at this time and I'm not having any luck on the internet. Can you help me please?

I don't actually have the game MVP Baseball with my own Sony PSP (in fact, I only have one game, Ridge Racer) but I have a sense that the problem you're seeing isn't with the baseball game...

Instead, I'm suspecting that you might have a bad...

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