I bought this faucet and am having the same issue with the nozzle sliding back into the mount piece.  I really like the look, but I am afraid that I am going to break my rather pricey faucet.  My brother and sister-in-law have the same faucet and they advised they are having the same issue with theirs.  Obviously a design flaw.  Please let me know what you can do to resolve the situation.