Hi there Rob,
The internal team has let me know that they are getting "no token" errors for your publicize connection - which does mean you'll have to disconnect/reconnect once again.
I know that you can't continually do this, because of your high pre-scheduled rate, so we can troubleshoot the email subscriptions.
Can you provide me with the date and time of the most recently missed email distribution, along with the title of the post in particular? We can take that information and check to see where the error is occurring.
Cheers!