It seems to be tracking the sun position, its deffo a strange one but very easy to replicate
Do you use HDR? or any GeForce filters?
HDR is on but the stutter happens whether it is enabled or not. Im conscious that we are polluting this thread. I have raised an issue for this particular “bug” so will post any further answers on that thread.
Does it still happen if the sun is blocked out by clouds?
Addding comments / questions from another thread