Z Wave devices continually fall off the network

Hoping I can come to the community for some help here. I've had my Ring system up and running for about a year and a half with zero issues, loved it. Over the last several months, my Z Wave based devices have randomly fallen off my Ring base station's network. This includes motion sensors, the range extender, and my compatible door locks. I've replaced batteries, reset each device, done a factory reset on my door locks and my base station, and devices will work for anywhere from 1 day to a week or so before they fall back off the network.I just spent 30 minutes on the phone with ring support, who were generally very nice but were obviously going through a checklist of steps that we had to work through one at a time. Then they put me on hold and the line went dead, so that doesn't leave me feeling hopeful.