Ring Video Doorbell 4 - no light/doesn’t work as a doorbell

Evening all, Bit of a tricky one. Have had my video doorbell 4 for just over 2 years and it has been working fine until recently. It is still capturing video/movement etc but no longer works as a doorbell. Battery is charged etc and I have tried resetting through the app and resetting the doorbell with no luck. I did get the white circling light when I reset on the doorbell but then it went off. Any ideas / suggestions of what could be wrong with it?