Outlook can't receive emails except after restart

I'm using Outlook 2016 on Windows 11. I have three IMAP email accounts, all through AOL. When I click Send/Receive, Outlook successfully does sends on all three accounts, and receives on two of the three, but then hangs without receiving the emails from the third account.

If I switch to a different email account, this triggers a synchronization. If I then switch back to the problem account, there is no synchronization.

However, if I then restart Outlook and do another Send/Receive, sends and receives work for all three accounts.

This means that every time I want to check for emails from my third email account, I have to first restart Outlook.

Although I may have noticed this issue on very rare occasions over the last year or so, it didn't start happening consistently until August 29, 2025. Now it happens almost every time.  Out of well over a dozen tries, it has only not happened twice. (That is, there were two occasions when the emails were received correctly without a restart.)