I ran into this weird issue on IOS that does not happen on android or editor. The problem is it looks like the spot light is z-fighting with the surface its hitting. I have tried changing the camera's near clip to a higher and lower value and that has not helped. I think it has something to do with one of the shaders because it is only happening on certain areas, looks like only reflective surfaces. There are different shaders, not the same one so I don't think all the shaders are bad.