It sounds like your device behaves a little bit differently than mine, but maybe not that different. We don't get the error for any channel change, only Netflix. Otherwise, it's a very random occurrence. My wife likes using the Roku, because it has a headphone jack, and she's just more used to operating it. However, I also have an Amazon fire cube. Both have Dolby and UHD. There has never been a problem with the Amazon device, even though both devices are using identical 8K HDMI cables. What really surprises me is that we also have a Roku streaming stick, plugged directly into the monitor, and it will sometimes give the same error message, which suggests to me that the problem is in Roku software, rather than the hardware.
I heard somewhere that a slow or intermittent Internet connection can also cause the problem. If that is the cause, it still indicates a deficiency in Roku's functioning. I think Roku is desperate to avoid acknowledging the problem, as if they did, it would mean replacing all of the defective devices, which at this point I believe is in the hundreds of thousands.
