Lighting glitches (darkens) randomly during gameplay

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There has been this weird glitch that has plagued my entire playthrough (35 hours).
It is REALLY annoying as it happens randomly and frequently (around every 15-30 min). Toggling whatever setting and then jumping back into the game solves the issue but I essentially have to do this every 15 min. Does anybody have the same issue and know a fix for this?
And no, I have not installed any mod. I have played this game since 1.03 patch and it still happens today on 1.06 patch.

Here's a clip/tweet showing just that:
 
After investigating, the visual glitch has something to do with the option: Ray-Traced Lighting. Doesn't matter if it is on Medium/Ultra/Psycho, the lighting will goes dark after some amount of playtime, happens randomly: free-driving, cutscenes, dialogue, combat... you name it.

Glitch does not happen if I turn off RT lighting, with every other graphic option (except CAS) turned on.

My PC spec, even though I don't think it is hardware related:
AMD R9 5900X
RTX 3080
32GB RAM @ 3600MHz CL16
 
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