I missed a call the other day because I didn't hear my phone. Then I caught a call because I happened to have the phone on the desk next to me and I saw the screen come on and saw the incoming call, but it wasn't ringing. After the call I checked and sound was ON. I checked volume, and the volume sliders for ringer and media were both all the way to the left (0 volume). I didn't set them that way, I know that. And this isn't the first time it's happened. And just now when I went to look at my phone to see what the media slider was called (couldn't remember at the moment) it said my phone was set to silent! Why doesn't my phone want me to hear it? Why does it keep setting itself (in various ways) so that it doesn't audibly ring?! Anyone else have these problems?