I had the same problem at the very beginning. Did something wrong when mounting the brass pipe upside down with the result of jamming, leakage --> removing, cleaning, mounting again, and finally breaking both the pipe and the nozzle.
I ordered a replacement, but the pipe was out of stock. Then I went to our workshop and got a replacement within half an hour: pipe and nozzle in one piece, and all my problems are gone.
I guess it is a little design weakness to have two brass parts mounted against each other into an alu-block having a different thermal expansion coefficient: at 200°C they are no longer tight, tightening them at this temperature and removing when cold let them break easily. I have to admit that I haven't read the manual carefully i first place; it is written there to dismount the hot end at high temperature. But my solution seems to be much better.
Peter