Hello @bstein68, thank you for getting in touch!
Could you let us know which console model you have, and where your game is installed to (original internal drive, external, SSD)?
Is your console stable playing other games or does it show any signs of overheating?
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:
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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.
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Try to perform a soft factory reset while keeping games and apps.
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If the above procedures don’t help, please try to perform a full reinstall of the game.