I've been recently having some problems with Thunderbird (38.2.0). I'm using Gmail and Hermes (Cambridge Uni's email service) IMAP/SMTP. I receive emails through, but they are often delayed. For example, I got a pop-up saying I had a new email at about 16:10 this afternoon, but the email's time-stamp says 15:26. (I had Thunderbird open all that time - or at most laptop in sleep for a couple of minutes.) Other times I'll look in the morning and I'll get emails through in the morning that were sent the previous afternoon or evening.
This is obviously rather awkward when it's time sensitive! Any ideas what could be causing this?
I have recently changed from Kaspersky to AVG. (Kaspersky isn't (/wasn't) fully compatible with Windows 10, and I could only have it on one of my computers, so I've just got AVG Free until they fix it.) I've turned off the email scanner, because it always popped up saying "Email Scanner Error - cannot scan encrypted emails" - or something similar to that. This doesn't happen every time, otherwise I'd just temporarily turn off my antivirus; I don't really fancy having it off for a few days while I test!
Any advice would be most appreciated.