@Watts - you keep saying mesh extender - but the two are mutually exclusive - it is either a WIFI extender or it is a mesh node - i believe the ancillary units that Telstra shares are WIFI extenders only
I remember with one of your other problems a while ago we had one of your units (maybe the mancave) go into DHCP mode - do you recall that - it was when we were trying to troubleshoot some stuff after a power outage ?
Craig