Reply to traktor s4 led issue

when I turn on my s4 and open traktor pro 2.6.4 version all is well all my leds light up on my s4 but when I close my laptop an reopen it leds won't come on my s4 if I go to prefrences on tracktor pro goto led brightness adjustments move the faders, unplug an plug usb , turn off /on controller then leds come on . reinstalled version I had before no luck .I use to be able to close an open my laptop and leds would come on. called nI tech support don't have resolution , I did a reinstall of software program, drivers ,control editor nothing hope someone can help thanks