Ring Video Doorbell - Night vision stopped working

I have a Ring Video Doorbell (ca. 2015). It's hardwired, fully charged and in good health per the health check. I didn't use it much, but for years it would shift into a night mode via infrared or something so you could have a view at night or in lower light conditions. However, that seems to be no longer working. Any basic ideas on where to start troubleshooting short of power (which seems to be fine)? Should I try resetting it? Tim to buy a new device?