Ring© doorbells had a known issue that causes them to disconnect intermittently and they will sometimes never connect back to the network until you reset them manually.
If this issue persists please contact Ring Support to ensure you have the latest firmware version.
Ring© support has also recommended the following:
Set a static IP for the Ring© doorbell. If your plume network is in router mode this can be done by doing DHCP IP Reservation through the Plume App. If Plume is in bridge mode you could assign static IP through your router settings.