This is very strange... and I'm not quite sure (this would be more of a question for Epson), but a few questions/thoughts:
Are you printing from Mac or Windows?
What operating system version?
Have you uninstalled the print driver, downloaded a fresh driver from the Epson site, and done a fresh install?
Have you tried a different computer with a different OS?
Do you remember when this started, and what happened/changed shortly before?
I hope this helps, best regards~ Dana