I've had my phone for a week and a half now. one of the first things I did was change my notification notes and whatnot. it seems as if every time I change the ringer volume, my tones go back to default. it's SO annoying and frustrating. I'll change it and it will stick for a day or two then, once again, it resets back to the default tone (which I find obnoxious). can anyone help?!