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I have a problem on windows 10, when i load a file for the second time, i can't any longer upgrade the house.

My save files are completely screwed up. Played for the first time on normal with all graphic settings set to epic since my pc can handle it, and everything was fine until day 8. Then i noticed a heavy  frame rate drop, but changing to the lowest settings didn't help. Tried to switch to sandbox mode and the game froze. Restarted the game  and my save file was literally unplayable, so i deleted it. Restarted on easy and proceeded until day 3, then i saved to quit. The next day my newest save file was back to day 1 with all my stats resetted, and my older file was back, with a clone.