what causes user sync to deactivate a user?

I am using DW User Sync to sync AD using LDAP to DW in the cloud version 7.4
Works for most users just fine.  I have four users that get deactivated at each sync.  The logs just say that they are being deactivated but no reason for the action.
They are in the same group as other users and I cannot find the unique thing about their accounts that would cause this.  

Dear Jim Goodwin! It looks like the Community cannot answer your question. That's why we have opened a Support Request with the Number SR-157174-M1Q6W for you. A Software Support Specialist will contact you directly to follow up. We will update this thread with the solution as soon as we have resolved the Support Request. With best regards, DocuWare Support Team