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I doubt it is the starter if it is spinning. I'm guessing the sprag clutch is slipping. It is part of the starter gear train. Usually a weak battery will cause this. I think Grzegorz had this problem some time ago and he had to replace it. Usually corrects itself. What type of oil in the bike?
I had exactly the same problem ....cold difficult start ,just turning turning and when finally started there were no problems ....till one day did not start at all....no damage to cases but sprag clutch replaced.....that was about 2005 when bike had 13000 miles now still going strong with 82000.....
my theory is that something not catching very well but when engine is hot metal expands everything works ok
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