Yup, I think nerp has it. It sounds like one or more things in the chain is set to spit out a separator page either before or after a print job or both. Need to check the printer settings as well as the application settings to find out where it's happening and then change to suit. Most places that use separator sheets have the printer on a network with several users so it is easy to see where one job ends and another begins. Some also have a collection tray to gather and reuse the separators. So one of the settings could be in the networking setup rather than specifically in the printer or application.
.bh.