Ensure that externally mounted roll media is properly configured.
The media should ideally enter the printer through the fanfold media slot in the rear of the printer.
Lower the print speed to decrease the chance of motor stalls. A loaded media roll typically has the highest inertia when the printer gets it moving. Larger media roll diameters require the printer to apply more torque to get the roll moving.
When mounted on your media stand, the media should move smoothly and freely. It should not slip, skip, jerk, bind before moving or as it moves.
The printer should NOT touch the media roll.
The printer should NOT slip or lift up off the operating surface.