GI Flickering. Video attached

Hi everyone,

I’m having this annoying flickering issue rendering this test scene.
The scene is being lit by SunSky and Exponential Height Fog. All set to movable, since they are keyframed.
Rotation values of the directional light is being keyframed, not the intensity.
Lightmap is also built.

Can someone please help me get rid of this flickering?