I have a DX-4 Drone that has been working fine. After flying it this afternoon till the battery died, I plugged it in to charge. The unit's switch is off, but the blue internal light is still on, and the (2) white and (2) red arm lights are flashing. They will flash slow for a bit, then do a fast flash, and go back to slow. The body was warm from charging, but I can find zero information about the lights being on with the drone off.