Black ops 2 freezing on startup?

I start up black ops 2 on ps3, and it freezes on the startup video, right when it says "activision", and i have to eject the disk to get it to unfreeze. I unplugged the lan cable, tried again, and it started to work again. But when i plug the lan cable back in, it immediately freezes. Does anyone know... show more I start up black ops 2 on ps3, and it freezes on the startup video, right when it says "activision", and i have to eject the disk to get it to unfreeze. I unplugged the lan cable, tried again, and it started to work again. But when i plug the lan cable back in, it immediately freezes. Does anyone know how to fix this???
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