I had the same problem on 690, and Runner fixed it - costed me one clutch, but never had it after the fix. There is some weak point that can be rectified, I just have no clue what it is and how to rectify - I believe it was KTM Pretoria that came up with the fix originally.
Maybe give Runner a shout. Alternatively, hopefully somebody on WD will be able to point you in the right direction - they did point me, I just cannot remember who it was I have a hunch probably Bill the Bong, but not sure, sorry.