I have also heard of this issue. I was told by the person I traded with that this was often the result of people assembling the BB with grease which causes the titanium to seize and become more brittle. He also said that as an alternative to traditional grease that some type of copper grease is supposed to be used. I am not sure of the validity of these suggestions, however I have read in other threads that traditional grease is a no no with Ti and that using cleaners containing chlorine can cause the Ti to become brittle.