Hi all, I have a Gaggia Carezza deluxe, 2 years old. The coffee brewing is recently not working properly, it sounds as if the engine is very slow and no liquidis pouring out, it does this for a couple of seconds and then it goes back to normal for another couple of seconds, then slow again. When brewing only water it works fine. The milk foaming also works fine. I have just performed a descaling process a week ago. Any ideas?