Today I was out buzzing around and half way through the flight at 300M in the air and 1.7km away from my launch point, my video froze on the phone. Well that's a long way so perhaps I lost the wifi connection. I brought it back, shut everything down, rebooted the phone, powered up again - still no video. I could control the elevation of the camera and could turn it on and off. It will record video to the memory card. But no video transmission to the phone. I'm thinking perhaps the WiFi transmitter on the drone has died? One other detail... I never use the booster app but I did buy it. It's never done anything so far for me. Neither boosted nor interfered with the video. Mostly I don't use it. Today I thought I'd try it. Any chance this is related? Anyway just curious where a guy would start trouble shooting things?