not pumping?

Good Day the defy top loader Laundromaid , electrologic 1300m,DTL 1300.
The customer complained that the w/machine is not draining,i changed the drain motor actuator and it worked after a couple days the customer contacted me and said the w/machine is doing the same.
It will pump for 30 sec and then stop after 10min it will start pumping again and stop AND SO ON.
Please assist