Can't connect to Google Home with Wifi using iPhone 14 Pro

I have an iPhone 14 Pro running iOS 16.3.1, with Google Home installed I've been using it to control a range of Smart devices for many months.

Recently all devices became inactive (inaccessible) through my app, though my wife had no problem at all controlling them using an older iPhone.

I discovered that if I turned the wifi off, the devices were suddenly accessible again through my iPhone (my wife did not have any issue like this) – which was frankly bizarre.

I'm not aware of any updates to the iOS, or changes to the wifi settings before having these issues, though I suppose there must have been... this only affects my iPhone however when using WiFi. I can control devices using 4G and 5G, but obviously that's not ideal given I work from home I want the wifi on my phone to be used while around the house.

I've gone through the entire playbook of Google support, and as I say, my wife has no issue, so it's not a Google Home issue.

Other info:

I've a new Virgin Hub 5 installed, though the issues began before I installed this.

Everything else works just fine with Wifi, it's just Google Home that won't function.

Any thoughts anyone?

Thanks, Nick