So I learned a valuable lesson a few weeks ago. ALWAYS DO A PRE-FLIGHT CHECK! Even if you just landed and go to take off again. In my case, I had a prop loose or something and never checked after one successful flight. I had tweaked some of the settings on the auto modes like Position hold, altitude hold, and RTL. All three were still way too squirrelly for my comfort level so I put it back in manual and went to flying it myself. I took it to about 300ft about 75 ft in front of me and I heard a slight smack of plastic on plastic and then the thing just dropped from the sky tumbling end over end. It was at night and even after the crash the lights were on and it was flashing waiting for me to unlock the motors. I did so and even smashed up, 3 of 4 motors turned fine. One arm was smashed beyond recognition and one prop was nowhere to be found. I walked a good 200 ft radius looking for it and it just wasn't there.

Attached are some pics of the damage.

So I ordered a new body and also required a new ESC which was broke in half. I ordered that motor as well even  though when swapped it appears to spin up. I just don't trust it. While I was at it I ordered a power module and an upgraded GPS. I read the specs on the GPS that came with it and it's +/- 3 METERS. So, you know, nearly 20 feet of wiggle room. I don't know if that's part of the erratic auto flying or not but I figured it couldn't hurt. I went with a neo8M. We'll see if it helps.