My text messages will not give an audible notification. I have gone through the settings and verified there is a sound assigned to it, and yes, the notifications are turned on. I grt the pop-up notification at the topnotch my screen, but no sound. When I look at the notification settings, there is a greyed out bell with a line through it right next to the app name, and I can't figure out how that happened or how to make it go away.