Rendering issue, big black artifacts appearing during render.

Hello,
I am trying to render a scene using the movie render queue on Unreal engine 5.4.
During the render progress there are these blocky black artifacts that keep appearing from frame 60, which are not present in the viewport. I have tried decreasing the depth of field and tried reducing the motion blur to see if that was the cause but it was not the case. I have rendered out 13 other scenes in the same project file but its only this one that causing problems.

Any help appreciated , thank you!