Make sure you use a good usb cable from the RC to the Galaxy. I use the cable that came with my Phantom 3 Pro. I never had a problem. I also use that same cable to hook the Galaxy to my laptop, and it works great too, but the galaxy usb charging cable won't connect to my laptop. Thus I am suspicious about the cables.I have same one..maybe my settings are off somewhere. I want to use it!
Also I close all the other programs down when using the Galaxy Tab S2 to fly. Never had a problem. It's a very fast and great display. Good luck.
Joe
KC7GHT