I have a remodeled row house. I have one bathroom sink on the second floor that is behaving oddly. When you turn on the hot water only (this doesn't happen with the cold water on or in combination of hot/cold on), the water will run for a second and then very abruptly stop. There's a slight noise when it happens, like it's a pressure thing. If you turn the knob off, you'll hear the noise again, and then you can turn it back on. Sometimes, if you only turn it on slightly it will work, but when you turn the faucet on higher, it happens again.