The pattern is most likely Newton’s rings: an interference effect caused when reflections occur between two smooth, closely spaced surfaces. In photography this can happen with optical layers very close together, such as a mounted filter or another transparent surface in the optical path.

Given your setup, the UV filter is a likely thing to check first. Try shooting the same scene without the filter and compare. Also inspect for anything else that could place reflective surfaces close together.

Newton’s rings are the same basic phenomenon behind rainbow-like patterns in thin films such as oil on water. In imaging, they can also appear when slides or negatives contact another surface during scanning.

So the likely cause is not the camera body itself, but an interference pattern produced by closely spaced reflective surfaces, with the mounted UV filter being a prime suspect.