It’s Russian roulette with WiFi channels. As there are only 3 really available, when one is not overloaded other users equipment sees that channel as under utilised and switch to it, making it then overloaded. That’s why cable connected devices are always best.
Tudor
There are 10 types of people: those who understand binary and those who don't and F people out of 10 who do not understand hexadecimal c1a2a285948293859940d9a49385a2