Faulty pod

I have recently had VM fibre broadband installed with a Hub5x and two pods. Both pods worked fine for a time, but one of them now refuses to connect to the Hub.

I have moved this pod to several locations, including in the same room as the Hub. When I restart the pod it goes through the start-up sequence (judging by the lights), but it get stuck on the pulsing white light. The VM Connect app shows both pods, but tells me the faulty one is offline ("We couldn't find your WiFi Pod")

The Pod is plugged in and I have positioned it in a place where it should see the Hub. I'd be grateful for any advice as to next steps.