AexNSAgent.exe high CPU usage

Hi we are experiencing high CPU usage by the altiris agent, this causes the agent to either freeze or very slow to download packages.

Server:

Windows server 2008 R2, NS Version 7.1.8400, 8000 clients

Clients Windows 7, Symantec Management agent 7.1.15400.8400

Fixes tried so far

Set the server for the altiris agent to the following using the following script.

 Option Explicit
Dim objShell
Set objShell = CreateObject("WScript.Shell")
' Run SC.EXE to set recovery options to 'Restart the Service'
objShell.Run "cmd /c sc failure AeXNSClient reset= 86400 actions= restart/5000/", 1, True
' Delete object
Set objShell = Nothing
WScript.Quit(Err.Number)

Checked there are no files 0 lenght in the program files\altris agent\queue or tasks folder.

Any further idea?

Catherine