Hi. This is a quick question about a minor irritation -- recently my Avent Isis manual pump has started to sqeak. It doesn't do it all the time, but often it happens when I'm doing a 5am pumping in a room next to my sleeping baby and partner, and I'm afraid I'll wake them. Otherwise I love the pump, I use it once or twice a day and it works wonderfully for my needs. (My partner says the baby squeaks, so maybe there's a common explanation? ). I've tried adjusting the seals and sometimes it works and sometimes it doesn't. Anyone had any experience with this?