Errors with contolling solenoid pump using a NI USB-6525 SSR

Hi
We are using a NI USB-6525 SSR to control four 24V solenoid pumps at frequency of around 1-2 Hz. We were told that this device could control a number pumps at the same time, but we keep getting the following error messages after about 20 minutes. We are unsure if it’s the device or whether its the vi’s for controlling the pumps that are problem. Each pump is run by turning each relay on and off every 400 ms. Attached is an example vi for one of teh pumps. Each pump has a separate vi’s and there can be up to four pump vi’s running at one time. Any thoughts on what problem might be would be appreciated.
Note we have tried fiddling with the USB cables to the computer, but the issue still appears.
Thanks
Attachments:
example of error messages.docx ‏172 KB
Seawater pump 1.vi ‏31 KB

Hello, Diatom
Have you checked the power settings for the USB ports on your PC? It's possible that Windows is powering down the ports after a set time because of the power management settings. You can view these settings in the advanced menu of the Power Options on your PC.
Regards,
Ryan

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    Tom
    Attachments:
    LabVIEW RealTime Project.zip ‏193 KB

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    Zulfi.

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