"(I use a computer (Mac Mini) with an Ethernet connection for testing since this rules out WiFi issues and also allows for easy "right clicking" for the Nerd Stats and selecting other settings.) 1. You need to test at various times of the day. Usual...
I can confirm this. I have 1 desktop PC, 2 smart TVs, 1 Playstation 4, 1 Xbox One X. Only the PC can play 4k fine sometimes. All the other devices are having the exact same buffering problem. I can turn on the Stats For Nerds function in the Youtube ...
Got the Ignite Gigabit Internet 2 months ago and having the exact same issue. Tried different devices (different TV, different media players including PS4 and Xbox One X). Turns out it's the internet that's causing the lagging on anything above 1080p...