After a PC or laptop resumes from sleep mode, the encoders on certain DAQ devices stop working. Refer to Appendix C of your QUARC Installation Guide. It gives you instructions on how to change the default settings of the Power Management software on Windows 7 to prevent the system from sleeping. Go to Control Panel | Hardware and sound | Power Options | and click on “change when the computer sleeps“. Set the “turn off the display” and “Put the computer to sleep” to “never“.