Peter Thomas

Hi, I am in the middle of going through Halo 4 solo on legendary. Made it as far as Shutdown so far, doing a mission a day to save my sanity. Anyway I wanted to play some more today when, upon logging in, it appeared my Halo 4 had done a hard reset. All my mp stuff was gone and I got all the intro messages as if I just bought the game. My rank was still there though and as soon as I leveled up somehow I unlocked everything again. However I did not have the same luck with the campaign. For some reason in the mission selection everything was gone, but my current mission (Midnight on easy) still had a saved checkpoint. I therefore decided to load it up and do a speedrun in the hope that completing the final mission would unlock everything again. That's when I found this: I have already considered a corrupted save, but nope everything's fine. I tried moving the save files between storage devices but no change. So I wanted to ask, has anyone else experience this? Is there anyway to fix it? Does this mean I have to replay the entire campaign on legendary again? Hoping someone on here can help.