Official Wii U Gamecube adapter controls cutting out

[Super David]

(10-14-2015, 03:22 PM)Lucario Wrote: Can you test if the adapter will work OK when the gray end of the USB has been inserted as well? It's the cable that feed extra power to the adapter if the black one (data cable) doesn't give enough power.

I've also tried with both the gray and black cables plugged in at the same time and there doesn't seem to be any change. My controls will still cut out sometimes.