X8 "not responding"

I am using X8 in Windows 10. Just recently, I have been getting a Not Responding message every time I wake up the computer and return to my WP document. I have to close whatever documents are open and restart WP.

It may or may not be relevant, but I usually have two documents open in split screen mode (I'm a translator). Has anyone else encountered this problem? It only happens after the computer has to be woken up, but it doesn't affect any other applications, including Word.