I'm noticing sometimes the red arrow on the radar in the Vision App will start acting like it has a mind of its own. I've seen it start spinning in circles although the Phantom is not rotating at the same moment. Sometimes, it will jump across the radar. And sometimes, its may not show the correct heading direction. I see this happen even after a successful calibration. Is there some type of interference causing this? Or, could something be wrong with the bird and or the controller?