So about two weeks ago my 9-cup pot started failing. Instead of a nice rich flow, it did nothing until it started to boil, and then produced about 3 of it’s 9 ‘cups’ via a disgusting tasting over boiled sputtering mess.
I changed the filter. I cleaned the interior with a toothbrush. I blamed the beans. I blamed the grind. I was wrong every time. I was in despair. I youtubed.
https://youtu.be/4yGinq5NaCA?feature=shared
TL;DW: use thread tape to correct the fit between the funnel and the top of the water container. Works great!
This happens to my wife’s smaller one (maybe 6 cup) every few months. Generally the gasket is the primary issue and the second issue is she doesn’t tighten the 2 halves together very well.