Hello i have almost the same problem that Mosh11 is having, i remenber i installed the cssu app. and after that the phone started to work very strange (the same problem with the screen u have mosh11) i did a reflash and problem still exist i uninstall the cssu app and nothing. sometimes it drive me crazy that i have to punch the screen with my fist to make the screen to work. i really dont know what to do, i am thinking its time to change to another cell, and right now i m trying to sell it. i love the phone and i think is the best i ever have but this problem is annoying, i'll keep googleing if i can find an answer for this problem, because so far nothing can fix the issue.