Disc printing on Epson XP 760

I have printed hundreds of CDs and DVDs on various Epson printers. The current macine is an XP 760. It will print one disc perfectly, but will not print again, same or different label it doesn't matter. I am familiar with how exact positioning the disc on the tray etc is, but nothing seems to help. Any suggestions, suitable/effective swear words etc ???

Thanks if you can help