Pump lost suction

Kayla

I have a medela pump in style advanced. It's being used to exclusively pump due to daughter having a lip tie and can't latch correctly. It's only been really used hard for about 2 weeks 4-10 times a day and very lightly used before hand for colostrum collection. I've noticed in the the last day that the suctuon has gotten very weak. I've changed membranes checked to make sure all parts are sucure and clean. Still weak suctuon. Any suggestions?