Lately I have been constantly getting a notification about my ringer, it keeps on going back and forth telling me it's silent or it's on. It just started to do this randomly. I have tried rebooting my iPad mini, but I still get that annoying pop up, it blocks what I'm trying to read or type! It will literally flicker back and forth on my screen. Is there a way to stop this? I've looked in settings and can't see anything obvious. So frustrating and annoying.