So, whenever i start playing multiplayer on MW3, like at the end of the match or on the scoreboard(sometimes in the lobby), it freezes my PS3. Sound is not playing, buttons dont work, the only way to turn it off is to push the button on PS3. I have like 250 more gb free on my PS3.Multiplayer on Survival works fine. I have no scratches on the disc. I bought the disc on the day it was released. Please help!