usb 6008 digital output always low

[Jim12345678]

I have a usb 6008 working with a compiled LabVIEW program running on the 2014 run time engine that I use to toggle relays via the digital out ports (open collector).  The circuit is such that logical 1 mean off.  The code was running 24/7 for weeks withouth a problem and then all of the logic lines went low and staid there.  The code kept running and looked fine.  If you stop, exit the code and restart it works and has been for days.  Running on Windows 7.  Any ideas?

[crossrulz]

USB?  Go into your Windows Device Manager and look at the properties for the USB hubs.  There is a power saving "feature" in Windows 7 where the USB ports will be randomly powered off.  Turn that feature OFF.

[Jim12345678 · Accepted solution]

Thanks.  I'll give it a shot.

[Jim12345678]

Changed windows setting to not turn off the usb hub and the problem went away.  Thanks.