Hey folks. I'm on my second Moto X cause I upgraded to the 32GB model when it came out and on both phones at least 10% of the time I get a message, my notification sound doesn't play. It's not the volume setting. I'll be in the midst of a text conversation and literally holding my phone and the active display will light up with a new message but no sound after getting multiple messages with the sound. Has anyone else encountered this issue? Thanks.