Chosen Solution

i go through the start up process, calibrate the compass, and when I pull back on the controller levers to start the motors, blinking green lights on the drone go to red and it does not start. I have repeated the process and sometimes it does start and fly as it’s supposed to but most of the time it does not.

well I would start with what I know, batteries are full in both units ?….I think you’ve flown this combo before, did anything happen since your last flight, maybe a “light” crash , radio (controller) get “bumped” off the kitchen table? it doesn’t take much for a pcb to break a connection just to ruin your day. Without turning screws and opening anything up (not recommended) their are only a couple things it could be, I would start with the batteries