had a similar problem recently, down on the dpad feels stuck, and buttons work erratically or not at all. the worst part is the end key occasionally acts like it's stuck, making the phone radio cycle off and back on randomly. a few days later the led backlight for the call and end buttons is stuck permanently on, even after shutting it down by holding the power button. I took it to a sprint store, waiting for them to get a replacement for me.
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