BryceB has also had 1 or 2 60csx models fail because of rain too. He's the only one I know personally that has had issues.
I've got one myself, and it certainly gets wet. Its rated as IPX7 so I surely expect it to stay dry inside.
I wonder in any of these cases was the USB port being used for power instead of the 4 prong plug? Also were the rubber covers over these ports closed if they weren't being used?