When I first upgraded to 4K i had problems with the signal as i was running a 15m cable. I tried some other cables, but realised i had to get it down to 7.5m. And at a push I did. All working ok 95% of the time. However, the cable I have doesn’t seem to fit very well in the amp and he slightest movement resulted on loss of picture on my V6, XBOX or Samsung 4kPlayer. But with a wiggle, would come back on. I had other issues with the LG OLED and ended up upgrading a year later to the Panasonic. V6 working fine. Xbox working fine. And watched a 4K on the player after a few nights of having the TV and it was perfect.... Since however, I can not get the blu ray player to stay on. It is constantly flickering on and off. I tried connecting directly to the TV to test with another shorter cable and was fine. So yes, its the cable and I understand the issue with 4K over this kind of distance. But how strange that it was ok with LG and not with the Panasonic, even though it did work one night for a few hours. Any advice?