Roland SG300 keeps saying "end of sheet" and stops printing.

[DAHVID]

I've tried making the sheet length hundreds of feet long, drape the media off the roll so there's no tension, but it keeps wasting time and prints. Any solutions come to mind?

 

[Roland Certified Tech]

Sensor on rear platen. Remove the shiny rear platen with 4 screws.
Reseat cable on that sensor all of course with the power off unplugged