I'm dealing with the same problem! Tried every different setting and even bought a Belkin 2.1 hdmi cabel that can handle 8k but still the same issue on ps4 pro! I also bought a hdmi switcher that can handle 4k,hdr and hdcp 2.2 but the screen still loss signal for about 5 seconds, usually once or twice every gaming session! The only ¨fix¨is to turn of the UHD color option on the samsung tv. However, that means we are stuck using the inferior YUV420 2160p option which is not ideal. Been in contact with both Sony and Samsung but i never got a fix after months of trying! Only real fix is to buy another tv, but this handshake issue is on many different brands across all price ranges. I'm using UE55MU6195UXXC.
This has been an issue since 2016 and was widely reported on the flagship KS series back then so don’t get your hopes up for a fix to it.
I tried various HDMI cables over the years including kabeldirect which seemed to work for a little while then out of the blue would start flickering again.
I can confirm it now also happens with the new PS5.
it’s ridiculous you pay so much for a TV for it to do this and then be ignored by such a big brand who’s probably most famous for their TVs.