i have a google nexus one from htc and today it just suddenly started vibrating on its own.i tried to use my messaging system and i could not send any messages,i tried to make a call and could not either because when the screen locked i was unable to slide the screen to open the phone.i shut down the phone and restarted it but i encountered the same problem..can anybody tell me why this is happening and will my phone go back to normal?.besides this recent issue i love the phone,it works really well.please help