When I use my finger to scroll up or down with my music or any app that requires a scroll. When my finger scrolls up and it doesn't leave the screen the interface shakes around and wont remain stationary. I am not sure how to explain it but when my finger is not moving shouldn't the interface stop as well? And not jiggle up and down and around my finger? Thanks for any help, I am not sure if its software or I need to send it for a replacement.