Issue is present ever since I have the phone (2013, october). Some apps send push notifications on events. The apps I use that make use of this: - Livescores (soccer) - Notify My Android - Flitsmeister The first two fail wholly. There is no notification, no sound. I've come from a Sony android phone (Xperia P) where these would function fully. So it's not a settings thing. Expected behaviour would be a notification in the drawer and a sound. The last app (Flitsmeister) doesn't work for the first sound alert (sometimes the vibrate function does work). The notification does work! Just no sound. I suspect there are a lot more apps that do not function due to this bug. I've checked the notification settings for all apps: they are set to status and notification.