Hello DoomMeister and 7Cyclops; following your advice, I tested leaving the drone on for 1h20 in an open area. It certainly helped, but I still have the same problem for the motors starting, beeps and lights flashing red. I also tried to start the motors by disabling the GPS and removing the propellers, same thing. I'm not sure but the GPS doesn't seem to be in question. And I wanted to launch a compass calibration to see, I always have the message "check for geomagnetic interferences" which is displayed as soon as I launch it. Steeve Lebon, a Yuneec specialist in France left me a message that I had to magnetize the compass by leaving the drone stored too near to a magnetic source; it is true that it was stored 50cm from an electric radiator, I don't know if a radiator can have this effect on the compass, but it does not seem impossible to me. What if this is the case? Is there a solution to demagnetize the compass or should it be replaced (if this is the problem and if this spare part can be found on the internet)? Thank you for your opinions. Anthony