When I use the slider bar to silence my calls etc it silences but won't vibrate to tell me something is happening. I have the vibrate set to "only vibrate' in sience mode. In addition when I slide the sounds back on, for some reason the text alerts will not work. The only remedy I have found that works so far is removing battery and replacing it again. My system is cuurrently up to date. Anybody know how I can fix this annoying little problem?