Hello creepy clutch patients.
I had this issue since new, on a 2003 model. The factory's improvements where the installation of an oil reduction jet #30 instead of a plug, close to the clutch slave cylinder and the update of the clutch pushrod. Other updates were made to the slave cylinder itself.
On the clutch my conclusions are as follows:
The deeper steel plate gets a groove from friction to the belevil spring. It should be swapped with a healthy one if the groove is getting deep. This can be quite an improvement by itself.
The central nut holding the internal basket in place can get loose. This should also be adressed as the power of the motor passes through there.
The oil reduction jet can have its passage increased to 0.50mm.
Finally if all previous do not work, clutch plates need replacement. They tend to wrap from thermal stress and oil cannot separate them. In my experience after 45k kms clutch service life starts to get close to its end. Mind you there are some cheap after market alternatives out there.
There is always a reason!!