I have literally just switched to Swisscom and setup my TV Box 2 yesterday. It’s plugged in to the Swisscom Internet Box 2 with a Ethernet cable. subscribed internet speed is shown as 1 Gbit/s. I am however getting flickering and distorted playback every few seconds. This makes watching no much fun at all. switching from UHD to SD the problem occurs less frequently but still occurs.
not sure why there is any reason any device plugged in to the Internet Box would cause the TV box to perform badly. As mentioned the Tv Box is plugged in to the Internet Box directly.
There appear to be artifacts from the hardware not having enough resources to decide the signal properly as opposed to an actually network problem. Besides the TV Box has a Gbit/sec connection. are you saying that devices should be switched off and disconnected from the Internet Box when trying to watch TV?