DJI FPV Vision System Calibration Error

[akdrone]

I have gotten this "Vision System Calibration Error" on a few flights lately. There is a lot of snow below but there were always trees in the camera's view; never just pure white below. Is anyone familiar with this and have any advice before asking DJI support?

 

[careless]

downward vision doesn't work over snow and try cleaning your lenses