No sound from Device at the front door and no alerts on phone

Just upgraded to a ring 2 - The wifi is working well and I can view via live-view. But if anyone presses the doorbell, there is no sound to confirm button was pressed - nor do I get an alert on my phone, but on the device button, it flashes blue, but silently, as I said, no sound nor alert on my phone. Earlier in the day, it did work OK - then all of a sudden this problem arose. I did a new set-up of the device a few times, but the same end results each time. In view the wifi OK is and connected and I can see live-view, this causes me to scratch my head as connectivity does not appear to be the problem and on doing a wifi test via the app on my phone back to the Ring device says the connection is good. Any ideas anybody? Cheers and thanks in advance.