Thanks for your answers. I cleaned inside motors and around motors whit a brush for cleaning my computer keyboard. It works, it is very fine for that purpose. Before that, propellers did not function, they were stuck (Three of them) for sand I mentioned here.
The day I flew I did two tests. First no problem, I calibrated the compass ok (the blue circle complete, whitout empty spaces), the second fly I moved a little from my original position, about 100 meters away, and then appears a plane flying around my location and near to the earth, bad idea try to fly in that moment. I could not get GPS, move a little more and finally I got Calibration but the blu circle showed me some empty spaces for fist time since I try this Drone; The result: Lost GPS when flying and then return to home automatically but did not that way, the drone flyes away from me or the original position I take off and force me landing manually and crash over a lot of sand.
Never fly if the calibration shows empty spaces in the blue circle (controles says it is ok, but is not that way).