It refers to material that is not out of, or discharge instability, intermittent.
If the former, make sure the hopper inlet is smooth without causing a bridging phenomenon. Confirm gearbox in gear, the screw is in the drive, there may be a screw-off inside. In addition, if the temperature control is not good, resulting in material wound on the screw slippage, do not move forward, you must remove the screw, clean out the attachment surface, reboot.
If the latter, then click OK motor, speed is good. OK gearbox is good. If the above is good. Use a long screw barrel, if the time for a long time, and there may be a screw and barrel wear. We need to be replaced.