anybody else ever have the vibrate switch "magically" change from vibrate to "on"?? I can't recall it ever changing from on to vibrate in the same manner (or at least not nearly as much). This has proved to be difficult in some scenarios such as work, church, meetings, etc when the thing will just suddenly sound off. and yes i KNOW i had it in vibrate. Once I checked it after it make an SMS noise and the phone was still in vibrate... Does anyone else have this problem? Is it because I have my iphone naked so it's easier to switch the button back and forth?