My survival world that I have been working on for the past year has all of a sudden stopped working. It happened before and I was able to download an older copy from the online Playstation storage. However, now when I do that it does not work. Not a single copy of my world is working. Whenever I try to load a world copy, it starts the load-up and then the screen/game freezes, a whole bunch of pink & black squares show up and then the game either force closes (crashes) or it takes me back to the menu, saying there was a problem loading the world.