User interface rendering - Ultimate version - unusable
Answered

It looks like this when I am not running anything, not debugging anything. It just freeze like this without any recovery.
This only happens to my Ultimate version Not the community version which makes it worse for me.
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When exactly does it happen? Please share the logs/thread dumps:
https://intellij-support.jetbrains.com/hc/articles/207241085
https://intellij-support.jetbrains.com/hc/articles/206544899 .
You can upload them here: https://uploads.services.jetbrains.com/ .
So, first, the project gets loaded.
I left it idle for a while(1 hour)
Then I am trying to use intellij again, it freezes.
I have uploaded all logs to the link.
Does https://youtrack.jetbrains.com/issue/IDEA-210361 look like your case?
Using IntelliJ IDEA + JBR11 from http://www.jetbrains.com/idea/download/index.html should help.