I was playing COD Black Ops and everything was perfectly fine. After finishing a Zombies online match, I went back to the title screen, where I started a new campaign. I skipped the first part, where it went to the next part right before the bar scene. During this part, the screen blacked out and I had to restart the PS3. This kept going and going until eventually I took out the disc, tried to clean it, and put it back in. After doing this, I actually got into the actual gameplay, but while i was playing, I realized the volume was fading in and out on its own. By the time I got to the second mission, the volume was completely muted and the game froze. When I restarted it. I got to the title screen and it said that the file was corrupted. I loaded multiplayer and it kept informing me that the file was corrupted until it froze and I gave up. I am scared, please help!