Last Friday, about 75% of my Reverse Lookup Zones just up and disappeared. As far as I know, no one deleted them manually. I have looked through the event logs on all 9 of my DNS servers (5 are at a primary site, while 4 are at a backup site) and the only event logged is event ID 4005. It says that the server received an indication that a particular reverse lookup zone has been deleted. I have one event for each zone that disappeared. Nothing else. Does anyone have any ideas? Ever seen anything like this before?