[Lowell]

I have a Omnia SCH-i910, about a week ago it started not letting me make a phone call. What happens is when I dial a number and hit send the screen will say dialing, but nothing happens and i can not end the call without resetting the Omnia. Or it will say phone is off, but will not let me turn it on. Also if I receive a phonecall it will not let me answer it. If I do a hard reset it will work for about two hours. Everything else on the Omnia acks fine. Could someone please help me?