This happened to me early on, and I believe the culprit for this is the use of the pause button. But you need the pause button to keep the game time down if going for a 7-day or any low days game, so...
The key here is when you make a save, make sure that the "GAME SAVED" message is display on the screen. If it doesn't, then the game is NOT SAVED PROPERLY. Just unpause, move a short distance (like one step), then pause again and try to save once more.
As for your problem, I myself did not find a solution for the corrupt files (I ended up deleting them)... I had to replay from a non-corrupt save file and make sure this time around that the saves are done properly. As such, don't rely on the quicksave and autosave; just do a regular save.
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