I have one of these machines, but it's developed an aversion to frothing. Press the Capuccino button, it goes through the motions and starts to send steam through the frother attachment. Half the time no milk is drawn up - indeed bubbles appear in the milk jug suggestion steam is being blown down the tube. The rest of the time, milk is drawn up the tube (fairly slowly), but it never gets into the frother - it just sits in the tube. I have cleaned everything several times. There is no sign of any split in the tube, nor the frother and all the seals in the frother seam to be intact. I have tried the froth control needle in all positions. There seems to be a very good of steam. What is happening and why isn't it frothing ? All ideas grateful received.