hmmm, at a guess, i bought it new in september '07, so it was just over a year old when you bought it, so i'd guess at the very very most 10,000 actuations and that's being generous to be honest. Is it with any particular lens or anything, try cleaning the contacts on the lens mount and see if it happens, it definitely shouldn't be happening so soon (though i don't know how much you've used it lol).
FWIW, i never had any err99's on it.
I'm off the sat/sun after next and was going to suggest a dry run of the meet for the locals (Tom, pete etc?) Let me know what you think and we'll sort something out, my msn is in trust, feel free to add me