I've recently noticed a problem where my Superhub2 drops Wifi (2g and 5g). If you try and connect to the management interface when this happens, it won't load. However, ethernet connected devices still get internet access when this happens.
I use ethernet-over-powerline for my main PC so it's usually my wife (who has issues as her devices tend to be on the wifi), then when I get called to investigate I realise the wifi has gone off and I can't connect to the hub.
A reboot of the superhub always fixes this but I'm wondering why it's happening? The hub is about 2.5 - 3 years old.
Edit: amended the age of the hub because I remembered we were given a new one to try and resolve another unrelated issue.
I don't think switching the wireless channel will help, because the functionality of the router is crashing too. If it was just a wifi issue, I should still be able to access the router admin page over a cable, but that completely stops responding.
I think the wider issue that impatient mentioned below sounds like what I am experiencing tbh.