It's possible you've got an Empeg of which the date/time function is faulty.
I've also encountered this : every time I pulled the power from my Empeg (even for one minute), the next time it booted the date and time was reset to 12:00am July 1 2000.
I contacted support and sent my player in for repairs. I ended up getting a completely new one because David also wasn't able to figure out what was wrong with it. He would've Hugo take a look at it, but he was out of the country at that time.
Player shipped and received back in the same week...impeccable service...
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Riocar 80gig S/N : 010101580 red
Riocar 80gig (010102106) - backup