I tried removing the z wave device through the base station as removing the sensor itself doesn’t seem to work. Go to devices, base station, click gear, advanced options, z wave protocol, remove z wave device. Important, click remove device not reset network. If you click reset network all your devices will be removed. The next steps are more involved. Search the ring site for troubleshooting. I found an article about trouble shooting a motion detector. A little ways down you will find the procedure to remove a z wave device. This just worked for me and I was able to reconnect the sensor. Apparently the problems I have been having with the sensor were due to the firmware being out of date.
Hope this helps.