Is it possible that the USB port is going to sleep?
Other causes - bad USB cable, USB cable too long...
Usually, it's because the energy savings features all kick in after you've walked away, and the computer dozes off.
Talk to MCC directly, and they can provide more advice.
Every new computer that I get, I have to set up to not go to sleep when on power. The laptops and desktop type computers are not expected to run 24x7 unattended.
Measurement Computing (MCC) has free technical support. Visit
www.mccdaq.com and click on the "Support" tab for all support options, including DASYLab.
