Even if you turn off auto dim, it will still auto dim. I have no clue why it does this but I eventually got used to the dimming feature. That's the only thing you can do . Unless you're putting your phone in a controlled area (light and such is always constant no matter what is done) and its changing back and fourth, then I'd say the sensor in the phone is either bad or going bad.
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Sometimes, to save battery, I just leave my index finger over the LED to dim the light. It's often bright enough at the lower setting. One of the features I like about my old Treo's was the ability to manually set the screen brightness. Ah... if only one could design a PDA with those little features unique to each company that are real winners.....
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