Motorola V551 / V330 / V547 / V555 / V557

Ok guys so heres the thing. I've had my v330 with t-mobile for about 7 months. Didnt have any major problems other than the fact that the keys scratch the screen. Anyways, a couple weeks ago i was going thru my text messages and i pressed the right soft key and the screen flashed, then turned black and then went back to the wallpaper. Its done it numerous times and now all of a sudden all my signal bars will dissapear. I know its not my service because i use other phones and have no problems but i really like my moto. Has anyone else had any probs like this or know what could be wrong?