Axis M3105-LVE Showing Artifacts With IR On - Any Suggestions??

We recently put up 5 Axis M3105-LVE cameras, and one of them is showing some artifacts at night (see pic). This camera is mounted in roughly the same way as the others (under an eave facing out with IR illuminator away from the building), and the lens has no visible scratches / defects / water spots. We've tried re-positioning the camera (thinking perhaps IR reflection); and cleaning the lens with Prist and a microfiber cloth with no change. I also tried disabling the IR illumination from nearby cameras - but no luck.

Daytime image is perfect.

To me it looks like dust particles caught behind the lens that reflect when the IR illuminator is on. But the whole thing is a sealed unit (no dome on these units), so that seems odd.

Any other thoughts or should I just move to a warranty replacement?

M3105-LVE Sample

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