after I upgraded from 3.0.1 to 3.1 it seems like everytime i grab my phone and i'm in a bright room or outside the iphone doesn't adjust as well as it used to. My settings didn't change, the auto-brightness adjust is still on and my slider is still in the middle for brightness. Just wondering if Apple made it not so sensitive to make the battery last longer...anyone else having this issue or am I just imagining this?