Hi, our Accuri C6 has stopped taking liquid. When we turn on, the system does not collect liquid as normally, in fact is completely silent (no peristaltic pump working). The program asks us to refill the sheath fluid, although it is full. I can see no fluid going through the system. We have regularly replaced the filters. And we have tried cleaning thoroughly. I can see the problem is just the pump. Have you ever experience the same?