That's funny you say that because the exact opposite happens to me. Sometimes when I'm listening to google play music and I get a notification, the phone gets jacked up super loud and doesn't go back down until after I turn it down manually. Same setup, stock and no root.
But I've done multiple factory resets and this is actually a replacement handset and the same thing happens after I upgraded to 4.3.
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Stock MK4, Android 4.3 (w/ Knox) on my Samsung Galaxy Note II