During lockdown I've been keeping an eye on our network via the BT home hub app. We have a lot of devices in our house especially when everyone is home-schooling /working from home.
I've noticed that after a recycle of the router all wifi connections are more or less equally split between the 2.4GHz and 5GHz bands. I haven't split the bands but the app allows you to see which band the devices are connected to.
After a couple of days pretty much all the devices are pointing towards 2.4GHz.
I guess people are moving around a lot but it still seems odd, is it something to do with the 5GHz channel?
As 5ghz is no where near as good at penetrating walls and has therefore a smaller range, i imagine that as people move about the house, devices already on 2.4Ghz tend to stay on it, and devices originally on 5GHz drop on to it and don't fall back.