Weird Shimmering on Reflective Surfaces


I am making an interior environment (all static lights, no windows).
I’ve just noticed a strange shimmery effect on a lot of my small geometry and reflective surfaces. It looks kind of like the geometry is flickering very fast, or like it has ants around it? It seems only to show up at certain angles, usually in the center of the screen.

You can see it here on the shiny black material, the bottom of some of the wall panels, the emissive surfaces on the bar shelf, and on the big metal “cage” around the bar. I have tested it in an empty project and it shows up there too. I’m using 4.25.4.

Here are a couple of videos showing what I’m talking about. You will have to download them to see it clearly though.

I’m not sure why this is happening or how to minimize it! Has anyone encountered this problem before?