So this game and this game only causes my computer to completely turn off. Its not a reboot just a shutdown.
Its seemingly random, sometimes I can't make it to tartuccio in the prologue, sometimes I can make it to oleg. Does anyone else have stability issues?
Ok... I was having the same issue and it is nothing to do with hardware or heat. When I finally found it, it was bizarre.
I combed the EventViewer logs. Something in this game is calling SHUTDOWN.EXE from the WOW64 system folder. And it just quietly causes the computer to perform a normal shutdown. The calling application appears as "null" in the log, so it could be a service or some other thing bundled with it that is doing it.
I never could find any setting in the game responsible for it. So I solved it by renaming shutdown.exe to shutdown1.exe (you will have to use windows security to take ownership of the file, then set access to ALL for your user account first).
The problem went away forever once I did this and I have played the game almost to the end now. Previously, the game would just shut down the computer every 30 minutes of play. Now I can leave it running and come back and play all day if I want.
NOTE: if you ever do an sfc /scannow to fix any other system files, it will put shutdown.exe back and you'll have to do this again.
You can still use shutdown1.exe from the command prompt as normal. It just can't be errantly called by anything.
Windows shutdown will work normally as it uses an API hook, not this command line utility.
One of the weirder bugs I have ever seen. If anyone else ever figures out what the reason the game does this is, tell us here. :)