Extracted from these lines
[comment u/specialagentxeno] Huawei Router💀
[comment u/eter123] Ah the ol Huawei Chinese Spyware factory. On a serious note that "cable box" is struggling to process the video signal. Ive seen this issue on old laptops where the processors weren't up to snuff to output HD video. Unlikely a bandwidth issue.
[comment u/Due-Use-4460] Definitely hardware processing issue on whatever device is playing the video.