I am having an issue under my bathroom sink... when the water is running, and when I am using the faucet, there is NO leak under the sink. When I return home after work, or wake up in the morning (after about 6 hours of the faucet being off), there is water under my sink... at least 2-3 cups. I can not figure out where this is coming from? I have had two plumbers come to the house, and neither could solve this mystery! I have a video of this problem and can send it if needed!

Love to see the video if you have time. Best way to track this down is to wrap all piping and drains with toilet paper and also on the floor of the cabinet. Check every few minutes to see what shows wet first, I am going to take a shot at your trap connections