video link: https://www.facebook.com/100003861982580/videos/1854852927986755/

Problem 1: As you can see below image, the surface looks so grainy, in video mode, it moves around see below video link.

Problem 2: the reflective surface on the left is completely dark. looks like it only reflects the very first object it sees and it would not continue to calculate the reflection on the other reflective surface. I think this is why it causes it to show only a dark appearance. so is there a way to fix it? or I have to find some other non-reflective material to replace it?