changing channels? i like to go to youtube and play music. when i put this thing in my shirt pocket, when moving around, it hits fabric and every once in awhile it goes back to the previous screen or hits a new video. any idea how i can keep it where i want it and not have the screen be so sensitive? it's annoying. i've tried it with the screen facing in and out. i'm also way high so i may be missing something simple.