Chime no longer will connect to WiFI

My Chime has worked for over 2 years without fault.I now cannot get it to re-connect to the same wifi it has operated on since day 1.Nothing has changed on my wifi network.I've reset it, tried multiple devices, updated the app on device (iOs).disabled Cellular network.....nothing will work.I have reseved the IP addess in my router for the MAC address.Other Ring devices are connecting ok, just the chime that will no longer connect.any ideas of what to try or how to get it working would be greatly appreciated.