NEW Ring 3 stopped connecting to wifi - even after reset and router reboots

Hi Team I have a new ring 3 doorbell (purchased April 2021) that has been working for a few weeks, but kept dropping the wifi every now and then , but now it will not connect to my wifi at all , I have been through **EVERY** recommended process, including the full 20sec reset - with no success - I actually see it connect to the AP in the log and showing STA-ASSOC with packets going back and forth like every other connected device, but then it drops out and I get the right hand side white lights - I have tried rebooting the router/AP multiple times and having the ring device right next to the router and still get the same problem. Battery is also fully charged etc.. I have multiple devices connecting to the wifi including Alexa echo , TV, mobile phone, MacBook - so I know the wifi connections to the internet is working fine . From the Ring app I'm getting 11mbs download and 8mbs upload. After trying everything for the past week, can I have it replaced please - bought from Argos in the UK on 14th April