To bypass the sprint cabs, hard reset, then soft reset as soon as you see the "Customizing in 3..2..1" message.
If you have flashed back to the stock Sprint ROM and the problem still occurs, then I agree with gguru...you've likely got a hardware issue. Bring it into a repair center (with the stock ROM) and have it checked out.
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One ROM to rule them all,
One ROM to find them.
One ROM to bring them all,
And in the kitchen, bind them.
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