AD Op Master Domain Naming Response Monitor. This monitor generates an alert when the response time for a bind to the domain controller holding the Domain Naming operations master role exceeds a specified period of time.
This means that the operations master has been responding in a less than optimal time for an extended period (by default, 10 hours for most operations masters).
The Domain Naming Master might be overloaded.
Review other alerts generated from the Domain Naming Master to determine whether it is overloaded.