YIKES ....... we have seen a rash of "clutch problems" .............
It's most likely one or more of the following:
(no need to list - you all know what they are)
About the only way to tell is to "open it up".
When you have it opened up, I would lub the clutch fork, bleed the clutch system, inspect the transmission input shaft bearing, replace the clutch disk, pressure plate and throw out bearing.
There, that ought to fix it up.
humfrz