Tried some flying in Course Lock tonight with my P3A. Latest firmware and app. Everything was working fine then the video and application froze. I'm using an iPhone 6 on latest iOS. I couldn't even quit the app. Had to restart the phone. I tried it again after recovery and the same thing reoccurred. I was comforted by the fact that the P3A fails aged and began to return home each time. Before you ask, I calibrated compass before takeoff. Ideas ?