I have a Bayangtoys X21 that I love flying. I also like using the headless mode. Well, it no longer works. The transmitter will beep indicating that it is initiated and the lights on the drone are flashing to indicate that it should be working but it doesn't. Does anyone know if the problem is in the transmitter or the quad. I opened up both of them to see if there was anything electrically obvious wrong and found nothing. Anybody have any ideas?