Ring Doorbell 2nd Gen hardwired but not charging properly

My 2nd Gen Ring doorbell suddenly will not charge. Nothing has changed, it has worked perfectly for 4 years. I live in Northern California, the temperature here does not go below 40 degrees so it's not that. On the app it shows as hardwired but it will not charge past "very poor" even though it shows that it is charging. Is it an app issue? Or a device issue? I've removed it, re-installed it, no change. Any suggestions, ideas, anything?