for some reason, your file is getting corrupted. I don't know the cause. The last time I have it happen frequently, my hard drive was going bad. I got in the habit of saving incrementally (scenename1, scenename2) so I wouldn't lose all my work. I also had on the autosave to give me more options

I've also had it if my computer crashed while the scene was being saved, but I think you'd know if that was happening.

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