This happend to me...I'm not sure what's wrong but I just restored it and dumped everything back on the phone. If your phone isn't jailbroken I would take it to the Apple store and see what they say. You might get a new phone out of it.
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iPhone 3G 16GB - AT&T
iPod Shuffle 1GB
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MacBook
2.2GHz Intel Core 2 Duo
1GB Ram
120GB Hard Drive
Double-Layer SuperDrive
Windows XP PC (32 Bit - Professional)
2.5GB Ram
600GB Hard Drive Space
iTunes version 7.5
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