Have the dealer check for master or slave cylinder failure. Barring that, you've just experienced the dreaded hot weather mushly clutch phenomenon.
If the cylinders are fine, upgrading to a stainless steel clutch line and changing the fluid to some Motul RBF600 will do the trick.
The 350 has the same problem- it gets worse in the summer due to the ambient air temperature. The stock fluid ends up getting hot and eventually comes to a boil, both causing the clutch to lose pressure and ruining the fluid.
Good times.
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