It was doing some 180 degree spins when I had it up, then would quickly come back under control. At some point it was up around 300ft. So landed to check the props, etc. Everything was in place. Launched again and maybe two minutes in (don't know height, but maybe 75 - 100 ft.) it went into a freefall. It looked like the voltage suddenly dropped to zero and a rotor failure warning flashed. Or maybe I imagined that -- I was so freaked out that it was going to land on someone/something. So ends the saga with this drone. Makes me worried about getting another one...