Hi, thank you for contacting JustAnswer.com. My name is Russell. I will do my best to provide the right answer to your question.
I suggest that you go into the Epson printer's setup or settings, on your computer, before sending it a 11 x 44 banner print job.
Look for a 'print directly to printer' option, and make sure it is un-checked, or disabled.
Look also, for a 'print using buffer' or 'print buffering' or similar print buffer option, and make sure it is checked, or selected, or enabled.
Then see if that cures the problem.
Let me know also, what program on the Apple computer it is, that you are using to print the 11 x 44 inch banner from. That might need some adjusting also.