AE works fine but freezes after several minutes of work so I have to force quit

Greetings! 

I have 

which I had for some time and AE worked just fine. Then suddenly it began to misbehave - freezing after several minutes of work, just a rotating circle instead of cursor. The comp is not affected, just AE is freezing. So I have to force quit it. Although I am in Moscow, Russia, not everyone here is an evil pirate) so our company pays for a license, so I reinstalled AE via Creative Cloud, removing preferences and settings, to no avail. I cannot figure out what could be a problem, it began yesterday, and not going away( No changes in configuration or setup, no obvious trigger…. No error messages, no warnings...

Also, if I need to quit AE before it freeezes, it starts to freeze then, and fun lollipop begins to rotate...