I have 13 cameras, all on 2.4GHz + ~15-25 other devices depending on time of day. My config is

Fixed channelFixed 40MHz BWN only.3x3 radio (Asus RT-AX86U, soon to be an Asus GT-AX6000 with 4x4 2.4GHz radio

This config is super stable (all devices) except for three cameras. Of those three two will periodically disconnect and then reconnect within minutes. The third one however, would eventually (minutes to a couple of hours) get into some weird state that leaves it unable to send WiFi beacons. This in turn causes the router to think the camera has left followed by disassociation. The router logs show that once this happens the camera never again makes an attempt to rejoin the network. The only cure is to pull the power plug and reboot the camera. You can easily deduce this by looking specifically for DHCP events (request, offer, discover) associated with the troublesome camera's MAC address. Wireshark is great, but it always helps to know what the router thinks is happening as well. I am currently in the process of RMAing this camera (E1 Pro V2). There is such a thing as being TOO close to a router/mesh/AP - exceptionally high signal strength can saturate the device's radio. You might try increasing separation, even if only a foot or two

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