Office 2016 shared calendar not updating

On the user's Outlook I have made sure Cached Mode is not checked.I have renamed the OST for users and reloaded Outlook created a new OST I have created new profiles and reloaded Outlook to the new profile.Every time it seems to fix the issue temporarily but 1-2 days late the issue is back with various users.On OWA the mailbox is fine and no issues so it must be with the local users but it is odd that all 6 users seems to have issues at different times.What happens is Outlook generates too many connections to the server while attempting to cache the mailbox.My suggestion is to disable caching for the shared mailbox.To do this open the mail profile settings in Outlook and click More Settings.