I'm new to this and still learning how to fly my second hand H. But I did notice when I first got it and was exploring how everything came together, that for me at least, I had trouble getting the camera back on. Thought I had it several times, but could see it was not straight in relation to the drone. The rails/skis are very small and it's possible to only have one side connected. Even though I don't use the camera every flight while I'm learning, I never take it off, now that it's on correctly. (Yes, I know it is a good idea to not fly with the camera while learning.) So one thing to make sure of is the the mount is fully engaged on both sides. Another option if you are worried about it coming off is connect a small leash of fishing line or something between the drone and camera mount so if it comes off it doesn't fall to the ground.