Problem with UE rendering

Hello everyone, Iam sort of facing an annoying problem hopefuly somebody can provide me with a solution. Whenever iam rendering a dark scene that i lit up using spot and rec lights (no directional light) my rendering (64 sample .png) has some frames with a small pixeled black squares, sometimes they form a line. I tried so many yt tutorials to try and figure it out but i sort of reached a dead end. below is an example of black squared lines next to each other than seem to pop out of no where. Thank you for your time

the black squares that i mentioned earlier on on the boxes in front and you can see them in the back aswell.