SBS 2011 - DHCP Service Stopped and Settings Gone

I have three SBS 2011 servers, all recently patched and on different sites, and users are reporting DHCP issues.
When investigated the DHCP service had not started.
If you manually start it and then examine the DHCP all the settings have evaporated.

Has anyone else had this experience and what's the fix?
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edhastedAsked:
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Larry Struckmeyer MVPCommented:
Run the fix my network wizard for a temp fix, then examine the event logs for some clues.  Sounds like malware to me as there is noting in SBS or Windows Server that would cause this.  If there is another DHCP server anywhere on the wires that the SBS can "see" the SBS DHCP server will shutdown, but that should not erase all the settings.  To check, download and run a DHCP sniffer such as:

http://www.softpedia.com/get/Network-Tools/Protocol-Analyzers-Sniffers/IP-Sniffer.shtml
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edhastedAuthor Commented:
Run "Fix my computer twice". Says it has restarted the DHCP.
Once it had , once it hadn't.

Go into the DHCP and have to add the Server back. Then get message when examined:

"The DHCP Server you specified cannot be located. The DHCP Service is not running on the target computer."

And by then if you check the DHCP service is has stopped.

This is the first time I've ever known "Fix my Network" not to work.
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edhastedAuthor Commented:
Hmm. The event logs say that it has found another device with the same IP6 address. We don't use IP6. Can it be deleted?
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edhastedAuthor Commented:
The fix was this. Installed a new router that had an IP6 DHCP server running on it. Disabled the IP6 on the router. Then had to run "Fix my Network" a couple of times. I don't understand the event log message about identical IP6 IPs but the problem is now sorted. Many thanks.
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edhastedAuthor Commented:
See notes at bottom - cautionary.
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