IBM AIX monitor problem

IBM AIX monitor problem

Hi,
    I have been verified the CLI is correct and add the AIX Server is normal at the beginning.The CPU, memory, and disk usage according to normal.After a while(may be a polling),these performance parameters will not be able to obtain these values.But CLI validation is correct.
    I tryed to restart OPM Server and these monitoring data get these value.After a while,It will not be get.
    The OPM monitor some equipment and only the few appear such problems
   


     Could you please give solution for this it will be helpful for me....

     Thanks,
     Su

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