Can anyone identify this lighting/reflection error

I don’t know how to pose the question of what this error is aside from just sharing this picture so apologies if there are already a million answers to fix the issue.

It appears to effect reflective surfaces but only at certain angles which gives the appearance that the surface is flashing when moving around.

Lighting did get a full build and the issue persisted

Flashing, flickering, and jittering are usually either caused by anti-aliasing or some sort of z-fighting.

You can try temporarily turning off anti-aliasing in your project settings and see if that fixes it. If it does, maybe you could try a different type of AA? I suspect there may also be a way to make certain objects ignore AA without affecting the rest of the scene as well, but I don’t know how to do it myself.

Alternately, if it isn’t the AA, try moving the surface up slightly to make sure it isn’t too closely aligned to another object.

If neither of these work, then I’m not sure what it could be.

Thanks , I shall give that a try later and report back

Thanks Detach789, it was indeed Anti Aliasing and changing the AA setting in UE4 to Temporal AA fixed the problem (the other AA settings did not)

Really appreciate your help with this!