dhcp errors 1014, 1016 every week

These errors started shortly after applying SP3

There are no clues in the dhcp server log, ie no leases expiring or a
machine renewing their lease. In fact the only thing in the event log
which I don’t quite understand is that every hour or soI get a
message – restarting rogue detection.

Microsoft Knowledge Base Article – Q173396 DOES NOT solve the problem

I am able to repair/compact the database by stopping the dhcp server,
jetpacking it, then restarting the dhcp server. Error resurfaces a week or so later.

Even tried using a backup database from tape. Same as above.

If anyone can throw any light on this problem, I’d be very grateful.