IMAP Temporarily Blocked in Thunderbird on a regular basis

IMAP Temporarily Blocked in Thunderbird on a regular basis

I'm hoping someone can tell me why this is happening and give me a fix for it. This happens randomly within Thunderbird. Sometimes it doesn't happen all day; sometimes it happens as soon as I launch Thunderbird in the morning. Generally if I just ignore the error it will start working normally within 5-10 minutes. I'm generally only accessing the mail assigned to my Zoho account via my computer but occasionally through my phone as well. I certainly wouldn't have more than 2 simultaneous connections at once. 

Here's what my server setup in TB looks like.