i’m sorry to hear about that,
there’s a chance that the save files maybe have been corrupted, which I hope is not the case, but sadly, there is no other option that I can offer as this issue entirely relies on the RPG Maker engine.
If you wish to show some video proofs of this issue, you can send it to us on our mail address for me to review it and see if this is truly a case of file corruption or something else.
(As a side note, there is no auto save system, you have to save manually.)