Bests & Worsts Reviews from Amazon

We're using this pot to cook for two and it does a great job, save for one problem--the little float valve in the lid does not pop up on its own. In order to get the float valve to pop up, I have to tap on it or grab the lid and press down on it once enough pressure has been built up inside the pot. I can't tell if this is a design flaw or a fault of the valve--it's a pretty basic little thing and unless the valve is catching on a rough bore in the lid or something, I don't see why it won't raise up on its own. Once I get it to pop up, the unit works like a charm. I was hoping it was user error, but after four months of using the pot almost weekly and experimenting with advice from online, I'm pretty sure this isn't right. Maybe I should contact the manufacturer, because right now, I have to watch the pot to ensure it will build pressure.