Spoke with support earlier. He asked to remove the doorbell from the solar unit and perform a factory reset (hold on to orange button for 20 seconds) and re-add to my Ring account. So far it’s still showing connection as ‘Established’. Will keep an eye on the status and update in a few days.
I’ve noticed 1-2 weeks ago that Amazon UK had it listed as ‘not sure if this will be back in stock’ but then was available to order a few days later.