I've had my phantom 3 standard drone for about a year and I've always updated it when it has needed it and now the DJI go app keeps saying RC signal lost which means I need to reconnect the controller so I do and it flashes green (connected) but as soon as I touch the controller it changes back to flashing yellow and RC signal lost. when I don't have the app open it will flash green but as soon as I open the app it flashes yellow again. I don't know what to do? It seems to have a mind of its own and do whatever it wants. I can't get it off the ground.