Leaking is also normal, and new o-rings donlt do anything as the connection is poor to start with, even the Porsche's suffer from it. You can simply ignore it, as it;s no big deal, but if like me you want that last kw, then undo the clip ( note how and where it sits as you have to get it exactly right to save dropping a hose on the road ) clean up the connections with some degreaser and prepsol / metho etc, and silastic them together.

Afraid other than that, you will have to live with it. Point it out next service, maybe they have a dealer fix too.