Zenworks 6.5 front and back. One workstation container in eDir.

We have many laptops in the field with aircards from sprint and verizon. These are setup with NDIS enabled so that they appear to windows as a regular network connection (Not a modem). We have multiple instances where these workstations will reimport themselves randomly. We do not have this issue with our internal workstations. What causes a workstation to reimport? The only change that I am aware of would be an IP address change on the aircard but this shouldn't cause the workstation to reimport?