My shiny new phone was received on launch day and was activated without any issues. Suddenly this week, most of my incoming calls never generate a ring. I'll be sitting at my desk and next thing I know, my phone lights up with a voice mail notification. I'm on LTE with 3 or 4 bars most of the time. Do not disturb features are turned off, incoming calls are allowed for everyone. Callers get one, maybe two rings, then go right to voice mail. Anybody else having similar issues?