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Distance of device and blocking walls, pipes, and file cabinets are a major factor in the weakness of wifi. Furthermore, if your WiFI router is reaching its limit of bandwidth you could start seeing disconnects like this. WiFi itself works best between 5 and 150 feet (2 and 50 meters) with line of sight. Too close to the router, overlapping waves can cancel each other out. Too far you need a wireless distribution system setup with your WiFi routers to echo the signal of the same network beyond the stretch. When you are out of line of sight, this distance can be hampered by said devices. One way to test this is to look at your WiFi signal strength on your cell phone adjacent to the devices experiencing the most disconnects. If it is less than 2 isobars in any situation, you need a booster or a stronger router.

The last time I had anything similar happen was about 10 years ago. When one specific device connected, everything else on the network would start dropping and reconnecting. Turned out to be a problem with the router.

I’d initially suspect your Wi-Fi router is probably failing or bad, or you’re in an area with Wi-Fi interference, or maybe your ISP uplink is wobbling.

If you’re trying to run a whole lot of camera video, you may well be overloading a lower- or mid-grade Wi-Fi router or its available coverage, too.

Options include a replacement, and potentially a migration to access points if your coverage area is large or features walls or wiring. 5 GHz signal coverage drops off pretty fast with walls, too.

Some Wi-Fi gear allows scanning for other networks and for interference. Mac can use built-in or add-on Wi-Fi scanning tools. One network I scanned had thirty-some local Wi-Fi networks visible, and I stopped paging through the network list before it finished.

I chased one of these cases with some AirPort Time Capsule Wi-Fi gear a while back. The AirPort Time Capsule just dropped Wi-Fi coverage for about 15 seconds randomly, maybe once an hour and slowly more frequently, until the Wi-Fi became untenable. The Wi-Fi network scan had a wonderful signal coverage, right up until it dropped out, and then restarted. No errors were shown in AirPort utility and no amber light, either. Since then, I’ve met several that did this same drop-out. Overheating? Donno. All that Wi-Fi gear got replaced.

Not a huge fan of mesh networks, as when part of the mesh goes weird, it’s hard to trace what happened. Hopefully, that’s all improved since I last had one that needed troubleshooting. I’ve been running old-style, with access points, in the Wi-Fi networks I deal with.

Was the same with mine, caused by the wifi being Dual Band.