Bandwidth/Picture Resolution fade in and out

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NewbyOldguy wrote:

 I have no way of suppressing the two cable modem wireless networks other than to surround the modem with a Faraday cage.

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I called my cable company tech support and had them turn off the WiFi on my cable box.  Many cable companies allow access to their router for the purpose of changing the WiFi 'name' (SSID) and password and to do things like open ports.  The old days when there were actual buttons on the box to control 2.4G and 5G WiFi seem to be long gone.  If you can provide the specific model number of the cable device, we might be able to find the user manual on line.

There are strong opinions regarding the wisdom of having competing WiFi networks in one house.  At the very least, it would be better to have the 2.4G WiFi on different channels. (Although modern WiFi systems scan the 2.4G band periodically and switch channels.)  I am of the opinion that "I don't know." Logic says only one WiFi should be 'better'. But, people operate WiFii in the middle of a sea of competing WiFi networks (such as in apartment buildings).

If the tv resolution problem occurs on the cable system WiFi, that argues against the Orbi causing the problem.  If you call the cable system to ask, "Why is my tv resolution changing? (or my 4K Firestick buffering), I would not mention the Orbi.  "Well, there's your problem. Take that thing out!!!"  To be fair to the cable system, I would probably reproduce the problem with the Orbi WiFi switch off.  If it happens with no Orbi at all, then it's obviosly the cable company's problem.