Everything was working fine, but 3 flights ago, display on phone was fine, but was unable to take pictures or start a video. 2 flights ago, the display was just black, but the controls for taking a photo, or a video, or for adjusting the camera angle all seemed to be working ok. Then this last flight, the display was black again, and when I clicked the photo button, I got an error: Network connection lost. Will enjoy hearing any advice.