Constant IMAP error message

Every time a message comes in I get an Operations box with the message that "An error occurred [IMAP]connection was closed. I have to click on “Ignore all” and then close the box. After about the 50th time a day this gets really annoying. I’ve created exceptions for eM Client in BitDefender and Malware Bytes and it hasn’t made any difference. Any helpful suggestions would be most welcome.

The only “helpful” suggestion I would make is to turn off your AV and see if that works (no errors) take another look at the “exceptions” to ensure your have included the correct information.