This is the problem; the groupwise POA will stop responding because of user database locks, another issue, so I have to restart the POA in order for the DATA Sync to start working again. After I stop and start the Data Sync connectors in the webadmin page, any email sent from the iPhones while it was not talking is lost. This is a HUGE problem, because user think email is sent but it never is and does not show up in the sent folder.