Soldered? Or induction brazed? I've seen a few stripped off, or partially peeled and then snapped. Usually a large rock or hammer was involved. I've also seen M96 and M98 Mauser handles detached the same way.
Have you ever heard of a M7xx series action ever suffering a failure of both bolt lugs, with the bolt leaving the rifle?
Never seen it or anything close. My experiences leave me to believe the 700 action is the strongest safest 2 lug bolt action that has been made.
I have not seen much wrong with the 700's in general although when you produce millions of them over many years a few 'lemons' will be found...