“I've disabled the 2.4 Ghz network and now it seems to stay on the desired channel”
I presume then it was the 5GHz channel that was changing. By any chance were you using a DFS channel and radar was detected and the hub would then switch to a non DFS channel as required by legislation.
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