check filter 1st.sounds like motor brushes have worn out.tip machine backwards and you will see motor.remove motor brushes and check if they are worn away.a new brush would be about 4cm.if they are short pull the carbon bit out gentally (stretch it a bit)and refit brushes.if it now spins replace brushes straight away as they could damage the motor commutator and hopefully will work ok once again.
ck
February 2008