Hi @Vztech101, welcome to the community!

When did this issue first start ocurring?

Please ensure that your save is stored on the XBOX cloud before trying each of the following steps and letting us know if they help:

Reset the console cache by holding the power button for about 10 seconds until the console powers off, then disconnecting it from the power outlet for a couple of minutes, then try loading into your SP session.

Try to perform a soft factory reset while keeping games and apps.

If the above procedures don’t help, please try to perform a full reinstall of the game.

Do you have any saved session you’re trying to load into or are you trying to start a new game?

It’s possible that the saved database has become corrupted, would it be possible to start a new game to determine if this was the case?

Recovering old save games is only possible if you have a backup stored in the XBOX cloud, however, as that savegame was corrupted there’s no way to address that issue other than starting a new one, apologies for the frustration.

As you’re playing on a singleplayer session you may consider using the admin mode to speed up your progression up until the point of your previous game.