This is one singular wall with a singular material applied to it. I have redrawn the wall and reapplied the material, it happens regardless of material. It will show up right if I get close enough to the wall but not when I stand in the spot I am rendering from.
For me this happens when two faces are too close to each other and overlap. It also happens when the material is made of a texture that doesn’t render as intended in the lighting provided. The maps/textures are interfering in realtime but when you set the render options to different resolutions you may see different results.