Check water valve is shutting off quickly. Start the fill cycle and after a few seconds stop the machine. Press pause. Water flow should stop immediately. Try it several times. If it does not shut off or seems to hesitate then replace the inlet valve. If it shuts off straight away each time then remove back panel of machine & check the rubber tube on right hand side. Goes from low down on tub up in to the panel. Look for any cracks or holes in the tube which would allow the air to escape.
Lincoln Appliance NZ, June 2014