I've noticed a hot spot in some of the video I shoot, it seems to happen when I'm shooting a scene with the sun directley behind the camera.  You can see an example of it in this clip traveling from left to right, what's causing this and how do you get rid of it?   

There is nothing wrong with your camera, this is a perfectly natural phenomenon, it has a name, but I can never remember it. Your diagnosis is correct, it only happens with the sun at your back, and the only thing you can do about it is not shoot with the sun at your back.

there is nothing to worry about. just as Geebax said

It's physics at work.
You can avoid it but you can't get rid of it .
The name of the phenomenon is Heiligenschein (or it may be one of it's related variants).

It sounds like it's an atmospheric phenomenon that has something to do with water particles in the air, would a better camera with different lenses have the same problem?

Floreto Posted at 2017-11-29 15:27
It sounds like it's an atmospheric phenomenon that has something to do with water particles in the air, would a better camera with different lenses have the same problem?

No, you can even see it with the naked eye from a passenger aircraft under the correct conditions. A 'better' lens would not help.

Heiligenschein is German for “Halo” it is an optical effect that creates a glow of light around the shadow of the viewer's head. It is often known as a hotspot, and is due to the reduction in the proportion of shadows viewed at angles close to the backscatter direction. The characteristics of the surface the shadow falls on can also increase this effect.

So what you are seeing is the drones shadow moving from left to right, the drones shadow is however, to small to see, but obviously not the effect.

See the following image with a larger “drone” shadow.

Normal happens to all.