Kopano-gateway warnings in message log


We are running Kopano 8.5 on a CentOS 7 server. We recently enabled IMAP for a couple of users and since that time I see the warnings below in the message log, do I need to worry?

[kopano-gateway|T12028] [warning] {?} Error fetching mail
[kopano-gateway|T12024] [warning] Failed to save IMAP props 80070005

Kind regards,
Cor van den Berghe

Me, too … :(

Any help apprechiated.
Client is Apple Mail v.11.5 via IMAP

In my 8.6 no IMAP warnings