why do i get this in my render. in the first scene my areas where there is low light, where the arrow is pointing. i get weird colors in this area. how do i prevent this?

in this scene why do i get white dots or noises or whatever it is on my renders?
i usually get this when the light source reflecting on that material is the sun.

material v-ray setting on reflection layer:
highlight glossiness - 0.65
reflection glossiness - 0.75