This should not be related to the CPU, I think.
I once had a CPU overheated (I was careless enough to block the fan with an Audio cable when I assembled the system) - it doesn't reboot, but goes on stand-by (at least with a P4).
Maybe your power supply is not constant. I had a computer which would reboot everytime a truck passed by the house, because an internal power cable had loose contacts.
If this happened (juice cut off) in the middle of saving the game it might have corrupted the HDD portion you were writing to, so some header date AGS is looking for wasn't there after the restart...
I once had a CPU overheated (I was careless enough to block the fan with an Audio cable when I assembled the system) - it doesn't reboot, but goes on stand-by (at least with a P4).
Maybe your power supply is not constant. I had a computer which would reboot everytime a truck passed by the house, because an internal power cable had loose contacts.
If this happened (juice cut off) in the middle of saving the game it might have corrupted the HDD portion you were writing to, so some header date AGS is looking for wasn't there after the restart...