I have chatted with a Support tech this morning and linked this thread to them. Someone else said they actually spoke with a tech and they were completely unaware of the issue.
Now while most of you are reporting that you are just not getting notifications, I was not having audio in calls. Period. It was probably weeks of not getting notifications (since 13.0 hit ) before I knew that there was a problem. I just thought I didn't feel the phone vibrate.
But then I was getting calls with no one on the other end - or so I thought. Most were numbers I didn't recognize, so I thought it was a robo dial that was taking too long to recognize someone picked up. But then my friend calls, and there was nothing on the line. She called again- same thing. I called her, same thing still.
So I tested from my MagicJack and there was no audio at all with 6 calls tested. Rebooted, and everything is working again.
I test every morning to verify I am getting notified of calls, and so far, everything is still good, but some of you haven't had the success I have with rebooting.
Find the link I posted earlier for feedback and make sure that you note this thread.