Unreal SSR

Hello connoisseurs. Faced a problem, the solution of which I can not find, although the problem is quite common and I think the solution is still there.

Here are examples.

Reflections ripple. There is noise on the small details. The quality is very disgusting. As I suppose the case as an SSR, but I did not find its settings except in postprocessing. So I tried to change the quality through the console commands, but I could not find the solution. I would like to know if anyone has encountered such a problem, and what are the solutions?