Two though? that's some odds. I'd just run the ipod updater on those suckers. If it's still happening then I'd consider bad flash chips on them.

Tell us how it goes!
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MacBook 2GHz Intel Core 2 Duo w/ 2GB DDR2 RAM & 120GB SATA 5400RPM HDD
Canon Rebel XTI
Google Cr-48 Beta Laptop