hi !!! it sounds like your brushes have worn on your motor ! you can buy new brushes from parts repair shops although some makes of new machines have what they call hard brushes and when they wear they tend to damage the motor !! a quick fix could be to take old brushes out and file the surface flat just to see if it is them but unless your sure of what your doing it might be best to ask person in shop !!! hope its some help
ally
August 2004