mpc 2003 making its own copies

I have a customer who swears on thier new box the 2003 they will make copies of some stuff and days later they machine will spit out those copies on its own, just randomly reprints copy jobs from days before. Since its random its hard to confirm or test this, the firmware is up to date, they said its only copies not print jobs or faxes.

Anyone ever heard of a machine throwing out previous copy jobs on its own?