Lumen reflection blurry and inaccurate

as you can see.
No.1 part has some issue, especially when you move around, there would be some parts not reflect at all, usually on the rims of cam, besides the overall reflection is blurry.
No.2 part doesn’t reflect the hair.
the material I’m using just simply, white color, metallic 1, roughness 0, specular 1. theoretically it should be like a mirror. the hair material I’m using is ABC format with simulation.
am I set wrong material or the wrong lumen reflection setting, more than that how to fix the blurry reflection?