I was experiencing the same issues on my android. After 9 months of troubleshooting on the phone with Ring, I found out what the problem was. In your notification bar, Pull down the bar and clear the notifications from Ring. If you have more than 3 notifications From your device, you will no longer hear Your notification sounds. It is because of the update from the new Firmware of the app. I have called ring so many times that they have actually sent me a brand new ring video doorbell at no cost, wedges, and a supervisor even sent me a floodlight security camera that I have installed above my Porch , Also at no cost. That is how much I have been calling ring. I hope this helps everyone.