Just last night, I was talking on the phone and then all of a sudden the phone call drops and the screen goes blank. I see the phone restarting itself and wait for a while. I see the lock screen I had enabled on there, wallpaper still there, and hearing my texts coming through. Though I cannot seem to get the screen to recognize any touch. I have turned on/off the phone more than a few times, and had left it off over night. The phone has no scratches on the screen, and it is in perfect condition. Is it the screen itself the problem? Please help me. Thank you.