Using the unit to connect PC via Ethernet which is working fine.  Also to connect a printer which is only 2.4GHz band, and for wi-fi calling on a 5GHz compatible mobile (which connects at 5GHz). For that reason both wireless channels are 'ON', on both router and extender. All devices connect to the access point.without a problem  The phone however has a nasty habit of losing the connection to the access point mid-call. This could of course be either the router or the access point (or of course the phone!), but there is no evidence of a problem in the router logs.  Is there any way to examine what is going on on the access point?