22 days ago - AndrewT - Direct link
Has this always happened for you with this game on this computer? Or only since when?

After the freeze can you start the game right up again okay? Or do you have to reboot, or wait a while, before it will run again?

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 your Documents/Paradox Interactive/Stellaris/settings.txt and pdx_settings.txt .
From your Documents/Paradox Interactive/Stellaris/logs/ folder, attach system.log , error.log .

Please report the temperatures of your CPU and video (GPU)
1/ before starting the game up and
2/ after say 10 minutes' play.
If your PC's vendor has given you no way of reading temperatures, install
SPEEDFAN http://www.almico.com/sfdownload.php  
21 days ago - AndrewT - Direct link
Those temps are okay, problems start around 80c.

To stream did you install or use any video capture software? That should be disabled or turned off while playing now.

The crashes we see in stellaris.exe in that dxdiag are not familiar to me. We are also seeing crashes in MsMpEng.exe / mpengine.dll which I believe is part of Windows Defender - also not something I've seen before. Would you say you are having other problems in Windows , aside from these issues with this game?

Do CK2, EU4 and HOi4 work okay or have similar issues?  
19 days ago - AndrewT - Direct link
Do you have a save game file that shows this problem reliably? If so please attach it here.  

Links in this thread

Download SpeedFan - Access temperature sensor in your computer
Hardware monitor for Windows that can access digital temperature sensors located on several 2-wire SMBus Serial Bus. Can access voltages and fan speeds and control fan speeds. Includes technical articles and docs.