I HAVE A MATRICE 300RTK AND MAKE A TAKE OFF FROM THE TOLP .I SEND THE DRONE AT 60M HIGHT IN P MODE AND THEN I STAY IN HOVER FOR 5 MINUTES.THEN I PUT S MODE AND THEN  I TURN FOR LANDING .AFTER 5M IN STRAIT LINE TWO LEFT MOTORS STOP SADENLY AND THE DRONE COLLAPSED TO THE GROUND .DOES ANYONE CAN GIVE ME AN EXPENATION?????.I HAD NO ERRORS AT ALL FLIGHT.

THE FRAME ARMS WAS LOCKED AND THE LANDING GEARS LOCK AND THE BATTERY LOCK