Hub 5 SSID changed by itself (Again)

So I first had this problem back in Oct 22 (but can't revive that post because it's been archived). The Hub 5 renamed itself from VMXXXXXXX to UPCXXXXXXX. The password had not changed! I had done nothing to bring about this change. Nobody seemed to believe me or be able to offer an explanation, but I was able to rename it back to what it was before, and all my connected devices were happy.

A few months later it did it again, but this time I decided to leave it with it's new preferred name, and reconnected all my devices with the new/UPC SSID and (the old password) to suit.

Fast forward to this evening, and all my devices lost connection to the internet, so I rebooted the Hub 5 but when it came back on it had a blue flashing light. Rebooted it again and it's renamed itself back to it's 'VM' identity! But it still has a flashing blue light (which Googling suggests means it's not searching for a WPS connection like the Virgin Hub 5 lights guide states, but instead means the Hub 5 has deregistered itself, which requires Virgin assistance) and even if I tell my devices to connect to the VM identity, they report IP configuration problems.

I've used the app(s), and booked a technician, and will try the 150 number in the morning, but in case there's a known fix for this, can anyone shed any light (haha) on this issue, please?