I'll agree with the others, Seems like a Pressure Plate issue, Myself, I'd replace the entire assembly, Flywheel included.
a lot of times those hard [hot] spots on the flywheel can be blanchard ground to clean them up, but you don't really know how deep they go into the face of the flywheel. it will look good when done [ground], but if not removed entirely, will show up very quickly and the symptoms will return. i vote to replace the flywheel as well.
