Hi, I've been having some issues lately with some of my games - dual stick shooters, Brothers In Arms, etc. - where my left stick does not want to allow me to move to the right. It just stays in the middle when I try to move it to the right. What's really strange is that if I use my other thumb, it works! Being right handed I don't want to switch controls to lefty (some games don't even offer this options). Is there something wrong with my thumb? Or is there something in the touch screen that isn't sensitive enough to read my movement. Any help would be greatly appreciated.