I/o scan time exceeded its period

Hello
   I have been getting the error message "Labview: The I/O time exceeded its period" and wondered what might be causing it.
    The configuration is;
           Labview 2009 SP1
           9024 cRIO controller with a 9144 expansion chassis
           Scan mode time is 10ms with a publishing interval of 200ms
    The error occurs at seemingly random times when i download a vi to the controller to have it run there at startup.  This error generally occurs within 10 minutes, but can take hours.
    I can force the error by having the downloaded vi use a 9512 to control some motion, but it will eventually occur even if the vi does not use the 9512.
Any ideas?
Thanks
Steve B

Steve B,
I'm assuming you're talking about the real-time application running at startup on the controller, right? So, if you don't run it at startup (just normal run operation), do you still see the same error? What if you change your scan and publishing time to different values, say slow them down to 100 and 1000ms, respectively.
And what's your VI doing? Can you produce some code that illustrates the problem and post it here so that I may try to duplicate the problem?

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