The last couple of times that I've flown my Inspire I have had a problem keeping a signal. The first time I encountered a problem I lost signal intermittently even when it was in close range (less than 200 feet away). Today, the first battery that I flew I lost signal only a couple of times until I got ready to land, then I lost it all together. I tried a second battery and lost signal for most of the flight. Does anybody have an idea what is causing this? Up to this point I have not had any trouble keeping consistent signal while flying.