I had the same problem, Descaled like mad but did not fix. I had to remove the top cover(two screws from underneath and then wiggle it off). There is a filter just before the hose that pumps into the K-cup. I had to remove it and take it apart and clean out grounds that were inside. That fixed it. Not the easiest thing to get apart. You have to slide a band down far enough to separate it and access the inside to clean. I remove two screws holding it down and took the hose off the back(cut the zip tie) to remove and clean it. Put it all back together and it worked like new.