Thats a good idea If the drone wasnt flying funny before I would think you have a cable or connection problem of some kind.
I think thats the "mode" that pairs the controller to the drone.
Thinking back to previous flights.....did the drone "drift" in flight? Was its hover "steady"? if you experienced drifting or the drone hovered like it just came from the bar lol then you have a dead IMU and need to replace it.
I had tried the calibration outdoors too, the satellites are detected without problems, but the IMU calibration does not work. It could be a problem with the accelerometers.