Random Loss of Alert Sound/Vibrate

[buckguin]

So recently, my phone randomly losses alert sound or vibrate. By this I mean, I no longer get sound or vibrate when I get a call or text but I have sound for everything else. Itll vibrate when the text sends or things like that but I wont get any alert that Im getting a text.. I have to restart the phone and then its fine for a big, then it starts right over again..

I dont know what to do about it.. It wasnt like this when I bought the phone. Ive downloaded some new programs but it didnt start after I downloaded any of them. Ive completly cleared the memory and started over and still the same problem.. Any Ideas???