11880 stops printing halfway

Hi all!
I have an Epson 11880 and I’m trying to print from Photoshop CS. The size I need is 60” x 16’. I’ve tried printing several times at different dpi and in different formats and the print stops each time at about 134” and cuts the canvas as though it’s done. There is no error message because neither the software nor the printer seem to think anything is wrong.
I thought I had solved the problem last night with Photoshop’s arbitrary 30,000 print limit but even making my file down to 160 dpi to keep it in that limit didn’t work. I prefer to print at 240 dpi.
I’m running a Mac 10.11.6.
Thanks and Merry Christmas!