I've been experiencing similar issues after installing update KB5020880. My system has frozen multiple times, and I've encountered the blue screen of death a couple of times as well. It seems like this update might have some bugs that are affecting system stability.
To address the problem, I tried a few troubleshooting steps. First, I booted into Safe Mode to see if the issue persisted, which helped me determine that it was likely related to the update itself or a driver conflict introduced by the update. Then, I rolled back to the previous version of Windows before this update was installed. This seems to have stabilized my system for now.
You could also try running the Windows System File Checker tool (SFC /scannow) from Command Prompt in Administrator mode, as it can relieve find and repair corrupted system files that might be causing these issues.
If none of these steps work, you might consider waiting for Microsoft to release a patch or further guidance on this issue. Also, keep an eye on any new forum posts or official updates from Microsoft regarding this particular KB5020880 update.