[2021] Game regularly freezing

This problem happens only in MP play, and only when Discord is running, is that right? You can play okay in MP with no Discord, AND in SP with Discord, but not both?

Has this always happened since you've had the game? Or it was okay up to some point?  

Frankly that sounds like a computer or Windows problem, some issue in the audio or video area. I notice this in that dxdiag:

Sound Tab 1: The file CMUAC.sys is not digitally signed, which means that it has not been tested by Microsoft's Windows Hardware Quality Labs (WHQL). You may be able to get a WHQL logo'd driver from the hardware manufacturer.

And that device uses a really old driver:

Description: Speakers (Rage X60)
Default Sound Playback: Yes
Default Voice Playback: Yes
Driver Name: CMUAC.sys
Driver Version: 8.1.12.26 (English)
Date and Size: 13/02/2015 00:00:00, 613888 bytes
Driver Provider: C-MEDIA Inc.

Can you check with that vendor for a newer driver?  

Can they not run off the default usbaudio driver from Microsoft?

If not I'm not sure what else to suggest, sorry!  

Is that suspect driver now gone entirely? Maybe we can get a new dxdiag.txt please, plus all these files:
Documents/Paradox Interactive/CK3/pdx_settings.txt .
Documents/Paradox Interactive/CK3/logs/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  

Aside from the temperatures that probably doesn't matter, after the problem occurs is fine for the others.  

Those temps are fine.

But you have a problem with your antivirus app:

[22:11:07][virtualfilesystem_physfs.cpp:1581]: Could not open file: pdx_settings.txt, error: pdx_settings.txt permission denied

I'm surprised that hasn't had more dire consequences for you! Whatever AV app you use you'll need to make sure that ck3.exe is allowed through it, plus cpatch.exe and Paradox Launcher.exe .  

You might need to contact Avast support to make sure those .exe files can access that folder fully.