The only fix is to delete your save file. I think maybe you can prevent this from happening by not saving as frequently, but I've not tested it yet. Though that's still a temporary fix and it will come back.
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Yeah it really sucked, specially because it was hard to reproduce. Me and the people who worked on it never had this trouble because we didnt play long sessions, but instead specific ones where we just test whats new. It took months even after the first complains that I really had any clue about what the problem could be (doing different other types of tests before I actually found the bug), but yeah, now at least is playable!