I just got a Hi12 at the end of last week, and had the same issue–pretty poor sensitivity with the touch screen. But I think I figured out the problem just today–the plastic screen cover that ships with the Hi12 actually covers a plastic screen protector beneath it. I thought the plastic screen cover directly covered the screen, and so I did not actually remove it till today. That is when I saw the plastic screen protector beneath it. Anyway, I ended up removing everything, and putting on a nice, 9H glass screen protector, and the sensitivity is much improved.