I had this problem and called the Keurig support number. They helped me fix it. Your tool bag for this project is a paper clip. First, take out the plastic holder that holds the K-cups. You should be able to turn it a little and it just lifts out. Once out, take that piece apart. It easily snaps together and apart. Once it's in two pieces, you'll see the bottom of the small metal tube that pokes the hole into the bottom of the K-cup. Take the paper clip and insert it into the tube and see if you can dislodge any tiny bits of coffee, tea, or whatever you've been drinking. You can run water over the tube while you do this. Second, lift up the handle in front all the way up. If you look under the lid, you'll see the second set of tubes that inject the water into the K-cup. There should be three tubes. Use the paper clip and clean them out as well. Put it all back together and get a glass measuring cup. Run three batches of water through the machine without using a K-cup. Each time, note the amount of debris...