Vin PSk! listen to me

Is the falcon propeller fixed?

The Falcon flies more reliably and accurately than any other drone.
However, there is a critical problem that comes back every once in a while.
I'm concerned about the Falcon coming backwards (
toward the pilot) for no reason,

This phenomenon occurs both indoors and outdoors.
I'm also indoors, it's a sudden thing, 
so it's not accurate, but it seems that the other keys didn't work.
Outdoors, the Falcon suddenly approaches backward, 
so when I press the forward key on the controller, 
theFalcon moves forward, but it keeps coming back.
This seems to be a major problem that the manufacturer is not aware of.

Sudden reversing problem? what is the reason?
When it first happened indoors, there was a refrigerator next to me, so I wondered if it was the effect of the refrigerator's magnetic field.

But the day before, I flew it outside in front of my house, and a falcon came up behind me.

At this time, it was a little dark where I was,
So when there is a difference in lighting, the falcon moves to a dark place? I thought it might be this, this time the controller is adjusted

Can you tell me your case?
That will help me figure out the falcon reversing problem.