Hub 4. Only just over a fortnight old.
The settings now seem to be staying - at least, we reconnect after a reboot without problems. But I'm rebooting at least daily. (And the less frequently are days we're out... :-))
Hubby now knows how to reboot, but next time I want to log on before we do and see what the issue it. Whether it's the settings. Sometimes the WiFi is not there at all. Other times, it's there but insists it can't connect or the (saved) password is incorrect. A reboot always resolves it - but obviously that also disrupts the rest of the household!
The next time it goes, I will check settings to see what it's done, and ring again.
Alison