when i have my ipod touch on the lowest, or close to low brightness setting, i notice that my screen flickers when i tap the screen. is there a reason for this, like is it a hardware defect or can it be fixed by firmware update? i think i read something about a flicker before, but didnt catch it carefully. i also dont want to update to 1.1.1 because of reports that their touches dont have the same good quality screen and that there are no more "true" blacks. by the way, i have a week 38. any ideas?