iMac (10.11.6) USB (Photoshop CS6)

This issue appeared suddenly with settings I've been successfully using for some time now.

The other day, printer stopped about 1/3 short of completing image. Plugged USB into another port on powered hub. Printed again and this time, okay.

Again, today, same situation--image stopped about halfway down from completion. Then plugged USB plug directly into back of computer, and again image printed correctly.

I reinstalled the driver today, but haven't tried another image.

Any thoughts on how to resolve this issue? Thanks.