I've found this setting, and turned it off, but I still have the problem. Occasionally, the text message notification will blast in my ear. (Before I turned off the setting, it happened only occasionally too - during a call, sometimes texts came in silently, sometimes loud and so it seems changing this setting has changed nothing for me.) Additionally, my notification sounds don't seem to respond to changes to the notification volume setting. I can turn every volume on my phone down (but not off), and phone calls will ring quietly, but notifications will be loud. Setting the volume to 0, means no sound, but I can't get quiet sound. Any ideas? Samsung Galaxy Note 2.