I added a aol email to my inbox in the form of a POP3. Initially, it synced and received all emails into my zoho inbox (from the aol inbox) then moved them to the trash in  the aol inbox as I configured in the settings.

Now over the weekend, I see it failed to sync 4 messages from the aol inbox, yet it still moved them to the aol inbox's trash. It clearly isn't an authentication issue as it it's still moving the incoming messages in the aol inbox into the trash, yet it's not receiving/syncing the messages at my zoho inbox.

What is the issue?

Thanks