Yeah, I know about that, happens sometimes. This is different...this is when I start my PC and use my mouse and the cursor does not follow evenly, it stutters a bit, everything shows 120 hz..but something does now communicate properly and give this result. I check that everthing is ok, I check tv is showing 120hz with the remote and np and windows settings too. all is 120 hz. so then I have to change hz fourth and back in windows displaysetting. Yes during movieplay cursor is jumpy and normal. This is on a lg oled b1, not monitor.
I just started it now and now it was ok. I highly doubt it is my hdmi cable which I only hva good experiences with and I know Supra follow 4k 120hz, 48 gbps, tried to use other but always go back to the one I use now. I have to see if this happens the next couple of times..
I think when it happened I also saw some delay when selection some settings in Win setting..when I manouvered around I saw one or two times that OS did now follow properly when clicking on some of the settings.
I will have to see if this is settled now, in the days to come.