This question has probably been asked before and answered, but because of my bad English so I ask again. I often lose contact between the remote and my DJI Phantom v1 in flight. When my DJI is on his way back to home, I usually contact again. I have tried to fly on several different sites in the case, you are the disturbance in the air but get the same result. This can happen after 2 minutes flight or after 10 min. I've upgraded to the latest firmware No. 4.02. Anyone have tips?