As of recently whenever I try to edit the properties of a vector layer the entire program just freezes and I'm forced to end the process using task manager. I use Windows 10. Any reasons as to why this might be happening?
I, too, encountered this problem starting about a week ago. Thinking it might be a problem between QGIS and Windows 10, I started Windows in safe mode and ran QGIS 3.8.3. In safe mode, I was able to view layer properties dialogues without the program freezing.
I can't explain it, but when I then restarted Windows 10 in normal mode, I can now view layer properties without QGIS freezing, although the dialogue is a little slow to open, measured in seconds, not minutes. I don't know why this worked, but you might give it a try.
I find Windows 10 buggy, and Microsoft has a history of releasing buggy updates to Windows. Since the problem with QGIS began very recently, if running QGIS in safe mode then going back to normal mode doesn't fix the problem, or it does then the problem comes back, I'd try rolling back the latest Windows update to see whether that fixes the problem.
If you want to pinpoint what program or service might be causing a problem, try running msconfig.exe and experiment with disabling particular services. I'm not going to go there unless the problem with QGIS returns.