My cable is dropping signal for a second or two all the time when I connect it to my TV (LG OLEDC8) or AVR (Yamaha RX-V485). Audio is dropping most of the time, with some visual artefact. Sometimes the whole screen goes blank for some seconds before returning.
Tried two different computers, one with a Radeon VII and one with a RX 560 4GB, they have different driver versions. Same result.
Using 4K RGB444 8bits.
Using my 5m HDMI 2.0 from you gives no problems.