Hi - I'm using the Philips Avent electronic pump, and I just cannot get suction. Philips have already kindly changed the motor, and all the other parts look fine, so does anyone have any tips?? It worked fine until about 3 weeks ago, and it;s only 2.5 months old. Maybe I need to replace the petal cushion - lots of milk seems to go into the petals, and I can't seem to get a perfect seal. Thanks!