Is there a way to filter Activity Monitor by unresponsive applications?
When three or more apps are not responsive, it's almost always a symptom of a failure elsewhere. I would select one app and run system diagnostics on it. That gets a full picture of what is wrong and then you can log out and make a list of all the unresponsive apps - they will be the only ones remaining. 

When you log in again, start the one app that was hung. You'll quickly know if it has issues or was just waiting for some other resource. In time you can narrow down which apps are "collateral damage" and which are primary failures.