iPhone X WiFi fault

Like many I am having issues with the iPhone X and WiFi. I’ll summarise the faults the best I can:

1. WiFi turns off immediately after pressing the switch on every occasion.

2. In relation to point 1 the WiFi setting page will the crash and eventually go back to the home screen.

3. The phone will say it’s connected on the settings page but it will not be

4. On occasion it will say unavailable to join network.

Now I work for Virgin media so I am having to use my phone to connect to about 10/15 routers a day and it’s honestly impossible and I have to use customers devices which can be other iPhone models and they work fine.

I’ve attached a picture to evidence point 3