endotherm
 Second Officer
Flight distance : 503241 ft
Australia
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Usually the lenses used in this type of camera are made up of more than one piece of glass. They have numerous elements with different curves ground on them, stacked upon each other to converge the light rays in a particular way.
You may have a droplet of water condensation on one of these elements which caused a hazy spot when it dried. It would be difficult or impossible to see from the outside. Have you ever flown in locations where the humidity has suddenly changed? Taking it from an air-conditioned car to a humid park would qualify. Have you crashed on water or ever flown in the rain?
Theoretically a lens can be dismantled, the elements disassembled and cleaned, but it is a massively difficult and fiddly process. It would be easier and cheaper to find a replacement lens if that is the problem.
Have you checked that it isn't something silly like a fingerprint on the glass? Sometimes they aren't that obvious, and shooting into the sun can exaggerate it.
Your photo of the camera looks like it was shot using a potato and rendered in 16 colours. It is hard to tell but there appear to be a couple areas of concern which may just be reflections or other artifacts.
This phenomenon is correctly called lens flare. It is when a bright light like the sun hits the lens elements on an oblique angle and causes spots and smears to stack upon themselves. In your post #11 you can see a line of them on the top half of the video, all lining up to the large spot on the bottom half. As you fly towards the light source the flares show up. If you turn away from the sun, they will disappear as the side of the lens housing shades the lens from direct light. If you tend to shoot video or take photos towards lighting, you can benefit from adding a lens hood to your camera to shade the elements. They do make them for the P3 and are cheaply available on eBay, etc. for about a dollar or so.
In your videos, where you see the spot breaking up with horizontal lines, this is actually the spinning propeller providing shading as it is spinning at just the right angle. When it disappears, the arm will be solidly shading the lens. You can see the spot fade in when it returns in the first example as the aircraft rotates slightly and stabilizes on its heading. The large spot changes position on all your videos up and down slightly, but more left and right. This will be because you aren't changing the (up and down) tilt very much, but are flying on different headings into the sun. This suggests to me that the primary reflection is off the front curved lens element inside the housing. You might find that there is absolutely nothing wrong with your lenses, but this is just the behaviour of the camera when you shoot towards the sun.
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