Has this always happened? Did it start happening after updating the software or changing computers?
-Download and install the latest DVC2
-Update the firmware with the hardware tools application
-Connect the DMX output to the DMX input
-Go to the test tab within the hardware tools application and move the output faders on the left. Are the input values on the right stable?
If not, try a different cable. If this doesn't fix the problem: create an account at www.daslight.com/logme
if you don't have one already, add a returns address, e-mail me your serial number and I will set up a returns.