[2023] CK3 forces shut down of my PC

Right click on ck3.exe , properties, compatibility. Tick "disable fullScreen optimisations" untick every other box in that dialog, Apply and exit.
Then in the launcher Game Settings menu, select fullScreen display mode, Vsync off, cap refresh rate at 60.


If those don't help:
DXDIAG is a program you run from the Windows search box on the task bar. After running it will open a window and start collecting info with a progress bar in the lower-left corner. When it completes click the 'save all information' button and save it to a file then attach that file here.

Please attach here your Documents/Paradox Interactive/CK3/pdx_settings.txt .
From your Documents/Paradox Interactive/CK3/logs/ folder, attach here system.log , error.log , exceptions.log  

"setting_framerate_cap"={
version=0
value="off"
}

Are you sure you set that refresh rate cap? What fps are you getting in the game?  

I'm pretty confident your GPU is overheating. Why that cap is not working for you is not clear to me, but I'm starting to suspect an nVidia issue where it will only run at the rate set in Windows.

Try setting your Windows desktop to be 60hz instead of 120 as it is now, and turn on Vsync in the launcher Game Settings menu. That should hold it at 60 fps - do you get this problem again then?  

ecolupo said: The fps were capped to 60

Just to check - you saw that the fps rate never got over 60?

ecolupo said: I don't think the GPU is overheating, because in other games e.g. the Flight Simulator or Diablo IV I can play it without problems or random shutdowns.

Let's make sure of that. Please report the temperatures of your CPU and video (GPU)
1/ before starting the game up and
2/ after say 30 minutes' play.
If your PC's vendor has given you no way of reading temperatures, install
SPEEDFAN http://www.almico.com/sfdownload.php