AD Op Master Schema Master Last Bind. This monitor generates an alert when the response time for a bind to the domain controller holding the Schema 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 Schema Master might be overloaded.
Review other alerts generated from the Schema Master to determine whether it is overloaded.