Think in steady speed, not peaks
HD live television is comfortable when the connection holds roughly 10 megabits or more for the whole programme. A test that spikes to 100 and then falls will still stutter. 4K wants more, which is why it sits on Moon Max and only where the channel sends a 4K feed.
The last few metres
- A cable from the router to the television beats any Wi-Fi tweak.
- Other people downloading, or another IPTV screen, share that same line.
- A phone on the same Wi-Fi playing fine does not prove the television has a good signal. Television Wi-Fi radios are often weaker.
If the speed is fine and one channel still fails, use the buffering checks and then tell support that channel.