Just purchased a Phantom 3 4K that has a WiFi link to the iPad and I have 2 problems. 1. The picture on the iPad whilst flying is delayed a bit and jumps? 2. I have not got very good range, regularly drops out around 500m and sometimes a lot less? A friend of mine has the Phantom 3 2K which has a cable to link to the iPad and he does not have the same problems. He has a slight lag in the picture, nowhere near as bad as mine and he has 3 times the range. Any help or advice will be greatly appreciated.