I've noticed over the last two days that when I go to enter in my screen code to unlock the screen, the pattern is not being read correctly...like it's only reading one or two circles. After consistently trying, watching only certain circles light up, all of sudden it will unlock. When I try to select a certain app, it won't open...the screen/app displays will start shaking back and forth and my selection won't register. It's like it's trying to process what to do and it does eventually but only after what I described above. I've restarted, popped the battery out, restarted, made sure I had full charge...etc...anyone have any idea what could be the problem?