Planet shadow flicker and shake when orbiting their star.

I need help, the shadow of my Planets flicker when they orbit their star and my planets that I use as button are shaking rapidly while orbiting.

The Planets path are "Neptune/Sphere", When they orbit they flicker and have like large Triangular shapes at the shadow borders, they also shake. Also when I turn shadows off,it turns to a smooth shadow border.

The Planet Button path are "Main Camera/cNeptune". They are a clone of Neptune and is resized, position, and renamed. One Button per Planet. Those Buttons should not shake at all since they are all stationary to the camera itself, not rotation or orbiting involved, its just stuck to the camera. The camera is stationary or a child of the planet.

The planet rings over the planet also flicker, these objects are not touching or near each other. For 1 minute its flickers, the next minute it stops flickering. I played with shadow setting, no difference except shutting it off. I use directional lights.

Help please, this is a major issue which I cannot fix. I noticed mercury shadow does not shake or have strange shadow triangles, also the buttons don't shake.

P.S. The further away the Planets get, the more artifacts it gets and the shakier the buttons get. I can turn every objects off except for the light and the planet for testing, same effect. Unity Bug? I also did reimport all assets. I think once the shadow flickering is fixed, the rest will be fixed also.

David