I always sign out, before closing evernote. Yesterday after some time Evernote managed to sign in and after that kept working. This morning failed again, but eventualy sign in after sometime.
Tested right now to sign out and sign in, but it keeps failing.
"10:43:06 [ERROR ]   0% HTTP request failed, code: 429, error: OK
10:43:06 [ERROR ]   0% EDAMUserException: errorCode=INVALID_AUTH parameter="local: authTokenProvider.ensureAuthentication (NoteStoreClient)"
10:43:06 [INFO ]   Client synchronization finished, status: failed"