I've found that since the Lollipop update, the global "Do Not Disturb" setting seems to be getting ignored. I can have Do Not Disturb manually enabled (I have the ⃠ symbol in my notification bar) and still get notifications. The worst offenders are Facebook Messenger and IRCCloud. If I go in the "Sound and Notifications" settings and look in "Application notifications" both of those apps have the "Set as priority" set to "Off", which according to the description of the setting is required to be "On" for the app to bypass Do Not Disturb mode.
This is most annoying when I'm playing a game on the phone and the notifications pop up in front of the game causing me to lose points because I can't access part of the screen where something active in the game is happening.
Anyone have any ideas of any settings I might have missed or is this a bug Samsung/Verizon need to fix?