Application: VideoOS.Recorder.Service.exe Framework Version: v4.0.30319 Description: The process was terminated due to an unhandled exception. Exception Info: System.AccessViolationException Stack: at <Module>.NmDatabase.CmClientConnection.Clo

my milestone server stopped after every 5 minutes

This is definitely not a generic issue, and so may require comprehensive (and sensitive) debug information. Please raise a Support ticket for this. Thank you.