Cannot access Volumio via Wifi using BT Whole Home Wifi

I recently added 3 BT Whole Home Wifi discs to my network setup. These act as a mesh network around the house and all have the same SSID. The idea is that devices connect to the one with the strongest signal. It seems that Volumio is struggling with these as since I installed them, I can’t access the web UI. If I plug in an ethernet cable, I can connect and can see that Volumio can see the 2 nearest discs. It seems to be getting confused because there are multiple, identical SSIDs visible.

Has anyone else seen this and found a solution?

This is Volumio running on a Pi Model A with a Hifi Berry DAC. Software is up to date. All works fine hardwired, but not wirelessly, when it was fine before the discs were added.