Orbi Pro - one node reverts to factory SSID and stops other nodes accessing internet

Just adding some information to the above: when I connect to the (unwanted) factory SSID that connects to the internet, it has an IP address from the router's DHCP server.  When I connect to the SSID I set, it connects with some random IP address with no router DHCP server identified.

So in a table:

Node                       Connection                             SSID               Password            Internet Connection   DHCP Server   

SRR60 router          Connected to Modem            New SSID       As set in setup      No                              None

SRS60 satellite 1     Wifi connection to Router      New SSID       As set in setup      No                              None

SRS60 satellite 2     Wifi connection to Router      Factory SSID   Factory default    Yes                             As set in setup