Hi I've had a nexus 5 device for almost an year...no issues..then a few days ago my screen started shifting up and down at will...I might have dropped it but if at all it was no more than 2..3 feet..this happens on any app..even home screen...like the screen gets wrapped around and the top part shifts up and comes back up from below...js keeps shaking...i can type perfectly if only i can click at the right place...neither the glass nor the image appears broken...stock software...help!