Last night I was flying my FC40 in calm weather, after around 3 mins and about 70ft high the lights went out all motors stopped and it crashed on a hard surface in a neighbours yard. After retrieving it and assessing the damage, it had landed top down with the battery compartment open and camera 15ft away but not much damage else where I thought. Took it home plugged another battery in and no power, so I stripped it down to find the ground power wire had come off the board, what is worrying is that the ground and positive are not anchored to the main body of the body, so pulling the battery wire out time and time again could loosen the solder, this is probably what happened here. After further assessing the damage six out of the eight wires connecting the motors to the boards had also come off, this could have happened when the rotors hit the ground flexing the four arms. After soldering all the wires back to the relevant places I plugged a battery in and did a quick test flight, it handled well but only in attitude mode, stripped it down again to find that the GPS antenna had shattered The price of a GPS module here in the UK is £112, I have looked online and found the GPS ceramic antenna to the same spec in USA for $4.75 plus postage which I hope is the only part damaged on the module, well it's worth a try for the price difference. So this is just a word of warning to be extra careful when removing the battery.