I'm all ears on this one.
The starter clutch on mine sometimes doesn't engage cleanly. Now a couple of times I've noticed it doesn't disengage cleanly. It takes a lot more effort to kick it when you are spinning the starter motor too!
Normally for the first start of the day I kick it, both to ease the load on the starter motor and to keep my leg in practice. Sometimes I have to resort to the electric leg when I don't get it right and can't be bothered faffing with it any longer.