iPhone 6s Plus scroll problem.

Hi guys,

I recently bought a iPhone 6s Plus from an authorized outlet in India. I am noticing a wired issue while scrolling through any screen, be it in Settings, Contacts, Web pages or in apps like Whatsapp, Instagram etc, if I scroll a bit and continue to hold my finger on the screen, the whole screen starts to shiver ie moves continously up and down.. Is anyone else facing the same issue? Any idea how to fix this?