It sort of looks like condensation built up inside on the glass cover of the box protecting the lens. I have had a similar problem when the humidity is very high and the temperature near or just below freezing. I see your camera recorded the temperature at 35 degrees. You can see rounded edges on the lens cover suggesting something liquid and condensation droplets might explain it. If the problem goes away when the humidity is lower, you will know that was the problem. Or if you retrieve your camera and open it up and still have condensation on the inside, you will know for sure. I have had quite a bit of condensation over the last month with humidity levels frequently so high.