Solar Charger for Video Doorbell 3 Plus - Fail?

Hi. After installing the Doorbell 3 Plus with the Solar Charger where I had my 2nd Gen Doorbell a few months ago, it seemed that the Solar Charger had no effect since the battery drained completely. So I moved the doorbell awkwardly to the edge of the porch wall to get the full blast of the sun. Note I have a Spotlight Cam connected to a Solar Panel in the same area (to get both views of the door area) which stays between 92 to 100 percent charged (i.e., I never have to take out the battery to charge it). I now get the "Established" Solar Status instead of the message to add a Solar Charger. But the battery drains just as fast as before (about 5-8% a day). I have other Spotlight Cams and Stick-up Cams connected to Solar Panels around the house and they stay fully charged. Has anyone had any success with the 3 Plus Solar Charger? How can I tell if it's working at all or completely defective? Again, note that the Spotlight Solar Cam in the same doorway (about 3 feet apart) has the same settings & daily events, but stays fully charged. Any help is appreciated.