Touch screen problem in Nokia Lumia 630
I dropped a Nokia Lumia mobile down on to the hard floor when it was on. It fell down, but didn’t switch off and was functioning normally as intended. But after that incident, I have observed peculiar issue with the touch screen. If I touch somewhere it senses the touch somewhere else! I could believe that this is because I dropped the phone but this touch issue doesn’t happen all the time, also, if I lock and unlock the screen the issue disappears. So, my question is does this look like a hardware issue still or I can go ahead and claim warranty?