I just purchased the Phantom 3 Pro last week and am about 25 flights in. I ran into a "wall" at 1640 feet that I cannot seem to get past. I use an Android 10" Note 2014 tablet, so I got the Litchi App to have expanded capabilities. During the last two days I have been out and since I am getting more comfortable, wanted to push my limits of flight out further, but I am hitting a wall! I cannot get past this 1640 foot / 500 Meter barrier. Can someone tell me how they are getting beyond this "wall"?