I have a Sky Viper S1350 Stunt Drone that is having problems holding hover in the Auto Fly Mode. It takes off using Auto Launch but will not hold a hover. It gains altitude to approx 50 ft then drops almost to the ground then goes back up. Once it gets close to the ground I use Auto Land and it will land. This flew fine for the first few days. Is there a Manual Reset function I need to use ?? Frustrated in Kansas