I had to make an emergency landing with my X7 in a recent flight, due to the prop coming loose and falling off.
This shows the importance of doing good preflight checks, and making sure you think about where you are flying and what you might hit.
I was lucky to be able to avoid hitting some trees and a power line - but I wanted to upload this video to share my mistake, so that you dont experience the same problems as I.
I was able to find the prop later that day by watching the video and retracing the X7's route.