3080 here - not getting flickering, but I am getting artefacts when I'm at 4K 120Hz and a lot is being displayed, so not so much on a static desktop screen but during games.
Are you able to display 1440p 120Hz? That's where things really crap out for me.
Feels like the issue here is that it's struggling with anything approaching the HDMI 2.1 spec?
Yeah, seems ok at 1440p 120Hz & 8 Bit Colour.
It's when I switch to 2160p 120Hz & 8bit when the issues crop up. Flickering, occasional black bar and artefacts etc. Pretty sure the cable is good, ordered that yesterday from Amazon. Hopefully LG push the update out early next week as I can't use the monitor as it stands.