Same. 10.59.5 on the Mac client. Just started today on a notebook I started last week.
So far no problems getting to the notebook in question, but it does make me nervous!
Been dealing with this for a couple of weeks now.
Evernote 7.10
Mac 10.14.4
Always allow works for about 3 minutes, Deny works for about 24 hours. Tried the terminal trick and that didn't work either.