advice on steam leaking from arm on Krups 963/B

We've had a small Krups capuccino/milk-steamer unit 963/B for about 6 months, using it twice a day. Recently, it began to leak a little steam from the frothing nozzle, no matter how tightly the knob is turned shut. Is this a common problem, and is there any way to stop it? Thanks Tim
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