I have recurrence of the issue as of latest patch. I think it's just the number of saved files. I go in, delete a few, right as rain. If you just stick to keeping maybe 4 or 5 instead of dozens like me, you'll be fine.
What I've discovered is that it's the number of saved game files. Once you go above a certain number of saved game files, you can no longer load your games. I just go in and delete the oldest ones, then it's all good.