Doorbell Stuck In Loop

Hi - I have several ring devices - two outdoor cameras, one indoor camera and two Chime Pro's all working fine. However my battery Doorbell has stopped working suddenly. Came home to find the blue light flashing and no connectivity. I've tried resetting (both short and long presses), changing battery and moving wi-fi networks and its still broken. Basically it goes into set up mode (white spinning light) but can never find the chime pro or home wi-fi network. I've also tried removing it entirely and setting up from scratch but I still get stuck as it cannot connect to anything. Today when putting the battery in the app states its updating but 2 hours later and its still in the same state..... Any ideas how to break the loop? Or is it properly broken? Thanks. Rich