Fixed static camera that rotate unexpectidely

Hi,

Doing an opening screen in a space environment and i followed the UE4 doc on how to use a static camera in such end. The scene is quite simple with a plane rendering the distant stars, the sun, earth and the moon moving around it.
All in the scene is static except the moon that rotate around earth using blueprint.

At first all seem to work very fine, but after a few minutes, when the moon is out of screen, the camera rotate in a random direction with no reason at all while it is set as static and there is absolutely no control from the player over it.
I tryed all controllers to see if it came from it and i have no answer from the camera, but it will spine at a point of another with no reason.

Also the collision of the moon is set to no collision as i thought it could come from collision (even if it would be weird as she pass through the star plane with no troubles …) and nothing change.