Problem Printing Toward Far Edge

[yeags]

I'm printing a 48x36 image and as the print heads move toward the far edge, the printing drops off. Has anyone encountered this problem before? I've included a photo to show what is happening. Can't figure this one out. Very weird!
I'm printing with a Roland CJ-500 with eco-sol max ink plus heating system. Flexi 8.

 

[Malkin]

Try printing a different file, same size, just to make sure it's nothing in the file that is a problem.

I would guess encoder strip needs cleaning.

 

[Sticky Signs]

+1 with Malkin. You can also try to rotate the same image to see what's happening. If problem persists after cleaning the encoder, I would suspect the flex cable.