Shimmering/Spiral artifact lights in movie render using Lumen

In this scene a lot of shimmering spiral like artifacts kept appearing whilst the camera zooms back, reducing the skylight removed most of them but a few still persist, I removed any emissive materials but still no joy, anyone experienced similar or have any suggestions to try?

Here is another example, showing dozens of these…this is a still from D Resolve - any ides on what can be causing this?