The reason for this condition is that the motor on the hopper cannot get enough power or has lost the encoder signal

Incorrect calibration of crop check and Recalibrate
Power supply. Check battery terminals on the tractor. Clean if necessary.
Check all wiring for damage and for incorrect amperage cable.(12vdc 50amp cable should be used. (6mm))
Check all connections and spade fittings.
Check flat plug for connections across cable with test meter.(ver 2.40)
Check "euro" or "D' plug internal connections where it is plugged into the tractor.
Check that the jumper connection on the I/o board has connection, remove jumper clean the pins, replace the jumper put the controller into diagnostics and test the motor rpm.
Check the 7core cable for damage.
Check that the encoder wires are connected