Ensure that externally mounted roll media is properly configured.
The media ideally should enter the printer directly behind the printer through the fanfold media slot in the rear of the printer.
Lower the print speed to decrease the chance of motor stalls. The roll typically has the highest inertia when trying to start the roll moving. Larger media roll diameters require the printer to have more torque applied to get the roll moving.
The media should move smoothly and freely. The media should not slip, skip, jerk, bind and then move, etc. when mounted on your media stand.
The printer should not touch the media roll.
The printer should not slip or lift up off the operating surface.