Flickering for and GI not working in distances

I hope you are doing well
I confronted a problem with GI lighting in distances and also flickering fog in my latest UE5 Project.
Here is it:

The fog problem is visible in 3:10 to 3:30
And the lighting problem is visible in 1:36 to 1:45 in the background area.As you can see the lighting is changing in the back ground area.In some of other shots were the camera is far from some parts of the scene,there is no GI lighting at all .(such as 3:18 where the wall behind the three should be lit but is not!)
I changes the lumen distances options in PPV but it does not solve these issues.
Would you please help me with this issues.Thanks

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