Will be interesting to see responses and what the dealer says. I put 154k miles on my 2002 Wing and about 21k on my 2016 F6B. Never a clutch issue. Every once in a while both would jump up into 4th when I have done a lazy shift from 3rd and thought it had gone into 4th. Rare, but happens when I don’t lift the shifter hard enough. Never happens with proper engine speed and firm lift on the shifter.

Hope you get it figured out.