Ring.Com Pro Doorbell

I bought two.  One for the front door and one for the side door.  They worked fine for a month, then the one on the front door died.  Tried running just one instead of two but the one that started on the front door won't turn on -- it will only give a flash of blue once after disconnecting/re-connecting.  Won't do much more than that. I've made the side-door device the front door device.  But I would like to get back to two working ring.com devices.  24 volts strong to both devices. Can I get a replacement for the device that won't work please?