I don't pump regularly and haven't pumped much at all in the last couple of months, but I've been pumping every day to store milk for an upcoming trip, and I've found I get noticeably more milk with my manual pump than the electric one.

It's an insurance Medela PIS. It has new membranes and I popped off the faceplate and cleaned underneath. I didn't notice this to be the case when I used to pump more, but I also had an abundant early-days supply.

Is it possible I just respond better to the manual pump or do you think something is not right with the Electric one?