Charging Station: Crashing?

Recently received a [Charging Station](https://www.amazon.co.uk/ring-intercom/dp/B0B5FX7QHX) with the Ring Intercom. I've left it powered on, without batteries inside. However each time I have gone to install a battery in the Charging Station, it is unresponsive and showing 2 solid white lights (1 light for each battery slot - see below, always the same "stuck on" lights each time). Inserting a battery does absolutely nothing - the battery does not start charging, the lights do not change. It's as though the Charging Station has "locked up", and only after power cycling the Charging Station will it recognise that a battery has been inserted, and begin charging. But of course, sometime after I remove the battery it will "lock up" again (last time I charged was on Friday afternoon, it's now the following Monday evening, so it has locked up sometime in the previous 2-3 days). If you're not paying attention, you may insert an empty battery only to come back hours/days later to find that the empty battery has not charged at all. It's not a physical problem with the pogo pins detecting or making contact with the battery - if I cycle the power to the USB PSU while it is plugged into the wall (without touching/moving the USB cable, the installed battery or the Charging Station unit) the Charging Station will work as expected and begin to charge the installed battery. Is this normal (I can't possibly imagine it is), or is this Charging Station defective?