@David-TP I only use the 6GHz band for backhaul as I only have a few WiFi 6E clients. All I know is that the satellite Deco reports that it is using 2.4/5GHz rather than 2.4/5/6GHz. I did a speed...

The connection between my main Deco and the satellite Deco usually shows as Strong (2.4/5/6GHz), but after 6 days the 6GHz band stops and the signal is shown as Medium. After the weekly reboot...

@vecii you will probably find that it is your iPhone!

@David-TP My ISP is Aquiss in the UK. The loss of IPv6 happened twice with my weekly automatic reboot when using SLAAC and RDNSS (and required a reboot to fix). I have now switched to using my...

@David-TP if you click on 'IPv6 Connection' then you can manually set the DNS servers.

@philivey81 have a look at the IPv6 settings.