Why does my spot light + volume fog always have something like a Mosaic

Why does my spot light + volume fog always have something like a Mosaic and motion blur when changing position

You should try this command “r.VolumetricFog.GridPixelSize” and “r.VolumetricFog.HistoryMissSupersampleCount”.
GridPixelSize is xy pixel size per cell.(I recommend set to 2)
HistoryMissSupersampleCount is decrease noise when camera pan and camera cut,but increase cost.

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did you find a solution for this? im having the exact same problem but neither of those commands seem to do anything