My drone was performing flawlessly when it abruptly stopped flying. I repeated all of the calibrations, but the quadcopter never beeped, toned, or made any other sounds when I connected it to power. When I turn the throttle all the way up and plug it in, it starts to beep, but it’s obvious it was just the ESC calibrating. It’s interesting to note that my drone constantly performs ESC calibration. Usually, it only needs to be done once.