I'm seeing a pattern with Symantec Endpoint updates modifying the NIC drivers on servers and thus causing them to drop off the network temporary while the NIC driver changes.
Is anyone else seeing this event happen in Orion?
...Broadcom BCM5708C NetXtreme II GigE (NDIS VBD Client) - Teefer2 Miniport -- Interface Polling stopped. Could not remap interface. Check ifDescription change.