Video Doorbell 2nd Generation not working/connecting/doing much of anything

No matter what I do, my doorbell just won't respond to *anything.* I thought it was just a charging issue, since it hasn't been in use for a long while, but charging it only gives me an intermittent full flashing blue ring (as in, it flashes for a few seconds every five minutes or so). For about half an hour on Tuesday morning, and for two or so minutes Thursday afternoon (it's now Friday night), I was able to connect to the camera through the app - but as soon as it starts working, it stops again. No amount of pressing buttons, attempting resets, or playing with settings helps. I To add insult to injury, I got a "low battery" alert yesterday that says *"The battery in Front Door is at 100%, please charge it sometime soon"* :neutral_face: