Now there is a solution actually. I bought IV on release date and it froze up a little bit sometimes. BUT !. What i did was, I used the PS button to quit the game, then i booted it back up . wouldn't load, so i used the PS Button to quit once more. I took the disk out. checked the sides of my PS3. dusted them off. checked any other initial problems. all okay. I Popped in IV. I Left PSN on. It Loaded. I Carried on with a mission, saved it. then i turned off the game. and loaded it again. it loaded. so i tried online. played for half an hour. worked fine. so i quit out. loaded again. it was All working. So If this works im glad to help.