well went out tonight topped my last distance but good thing I didnt fall from the sky, came back in and just as I got it in and was coming down was maybe 20-30 feet off the ground and she started to fall like a rock tried to bring it up but she wouldnt go had a light crash on the ground, went and picked it up and one of the motors was really hot, tried starting it up and 3 of the props turned normally but the one wouldnt turn, think the bearing seazed up good thing it happened when almost home not 500 feet up yikes, no damage thou thats the good thing...need to find me another motor, is it good to swap out just one or better to swap out all 4? did get a snap shot of my distance thou....