Event Log Errors

Hi Everyone

Im getting alot of these errors in event viewer primarily for administrator:

Active Directory could not update the following object with changes received from the domain controller at the following network address because Active Directory was busy processing information.

Object:
CN=Administrator,CN=Users,DC=domainDC=local
Network address:
6478d4de-e4a7-47d3-9e06-483b699c87ce._msdcs.isambard.local

This operation will be tried again later.

Has anyone else had these? i also get them periodically for a hanfull of students

Thanks