Oh goodness, this issue is driving me up the wall. Running Evernote on Windows, v. 10.12.6.
It's terrible, you tab out for 20 seconds and switch back to Evernote and it's just staring back at you blankly for roughly 45 - 60 seconds. I can't wait that long so I continue my work on the other screen. It unfreezes, I write down a line or two and switch to my mail/browser to check something, when I go back to Evernote it's the same issue all over again. A terrible time thief.
Will try to check for a software update, because turning off auto-syncing is not an option.