I tried out my new a7II today with a new Zeiss Batis 18mm f/2.8 lens outdoors on a snowy river scene. A few of the shots had the Sun in the frame, and on every one there was a conspicuous pattern of green dots near the sunburst. Doesn't look like normal lens flare, but rather a "matrix" of equally spaced dots -- strange! It ruins the shots and I can't remove it decently in Photoshop. I assume it's an issue with the camera and not the lens, but I don't really know. Any ideas on what's causing this ugly artifact would be appreciated! Picture attached.
Steve