When you are monitoring services using Site24x7 Windows Server Monitoring, the monitoring agent will register the service for an instant notification for that service status change, which may get locked during the update and sometimes this can cause service lock.
We can stop instant notification for service monitoring, but we believe you will be getting alerts on next data collection, for that
you can change the "HKEY_LOCAL_MACHINE\SOFTWARE\WOW6432Node\ManageEngine\Site24x7WindowsAgent\EnableServiceInstantNotification" registry value to "NO" and restart the agent.
Hope this helps. Let us know for further questions, if any.