falling

Hi: I am a new p4 owner who just had my first crash. I can not however figure out why. I set the P4 up on level ground. I live out in the desert and there is lots of room to fly.I had a great flight. Took it up to the highest altitude 200'. After some flight time (still at 200'), I...

I made my first longer Litchi mission two days ago and suddenly the drone started falling down at around 200m height. After falling for a bit (felt like ages watching it on the screen) it caught itself and continued the mission. Since i don't want to loose my P4 anytime soon I would like to...