Dear Sir/Madam, Have used above Oxyjet for about 6 months, on Jet/Spray setting....very good, but suddenly motor has reduced power, one can hear motor is "weak" and pressure greatly reduced, on setting No 5. Have checked filter in head......any suggestions as to what I could do to restore power please, returning it to place of purchase not possible as was bought in another country. Many thanks, Regards, Roger Jackson.