Getting spurious notifications about authentication errors on Akonadi EWS resource

I have an Akonadi EWS resource set up for my Outlook 365 account. It kind of works, but every now and then I get spurious notifications about authentication errors on the EWS resource. I’ve changed nothing on the O365 side of things.

How can I find more about what’s going on? I have akonadiconsole installed and running and have logging enabled, but if I scroll through the list for the akonadi_ews_resource program I don’t see anything useful there.