Kitchen sink faucet. Single handle. Relatively new. Don't know brand, and it's not one of the major brands as far as I recall. When the handle is turned off, water stops flowing out of the spigot and a little continues to weep and drip for about 15 seconds. After that, there is no more water flow or dripping until the faucet is turned back on. When brand new, this faucet turned off immediately when the handle was turned to the off position. Now it takes 15 seconds for dripping and weeping, and when that's done, it stays dry. Not a problem, but since it did not behave this way when new, I'm wondering if the valve is failing. I'm guessing maybe some sediment and mineral buildup in the valve body allows a little water to continue to pass through until the valve fully seats. Anybody have a diagnosis? Wish I knew the brand of faucet and that I had a pic, but I'm far from the faucet location for a while. Advice? Thanks in advance.