From subway town. Mission from Marshall asking you to go to the jackal territory. When i try to enter it gives me an error when trying to save. Hit retry same outcome. Then it slows up my ps3 to the point where I just have to hold the ps3 button and quit game from there. Any suggestions?

Also, as soon as I enter the jackal canyon territory everything gets all screwy. Sound in and out and that's when the game begins to slow