Whenever I go on the moon or the dreadnaught the game freezes then crashes. The moon at least runs for a minute or so before it occurs but when I try to start the dreadnaught mission to unlock it on the map it just crashes before I even arrive. Sometimes the game crashes in the plaguelands too but most of the time if I try again it's fine. I even bought a new disc and it still does it. How do I fix it?