In the last three years I can think of the following snapped frames with the guys I ride with. Not sure if you would class them as high end frames but all between £1.K-£3.5K for the full bikes to buy.
Cube AMS x 2
Cube Stereo
Specialized Epic Carbon…( 3 times frame replaced)
Trek Remedy.
The Remedy was just before Christmas.
All of these were sorted under warranty without much fuss, by the LBS’s they were bought from.
A few things have occurred to me about this.
It would take a brave design team to say to their managers “do you know what lets, just tweak last years design, instead of designing a new bike”
New bike designs are being Beta tested by the owners.
Do the really big boys sell so many bikes that just sit in sheds and garages un-ridden, that they are happy to fix the few that are ridden hard.
I am happy with my Five.