If your file names are changing, then the most likely causes are a user mistake or failing hardware. The game does not have any functionality to rename files and I have not seen any mods that do this. The cause of your problem cannot be determined without a specific error message. If your operating system is not providing the error message, then the Debug mod (https://itch.io/t/1137280/debugmod-v10d) can be used to have the game provide error messages.