Hardwired Ring door bell no longer charging.

Hi, my hardwired ring doorbell (which has been installed at this property for some time) has decided to stop charging from the mains. The little green battery icon says fully charged (and still charging) but if i go into "device health" its says power "poor" and i am now having to charge the unit via USB. I have seen this exact same issue cropping up a lot on the forums and it seems to be due to a recent firmware upgrade? I have circuit tested the feed and there is no issue there, please tell me there is a fix on the way??