I have had the dog bone pop out twice now. Is this the reason why? To me it doesn't seem like wear there would make the dog bone pop out. I also had the diff out drive come loose both times it happened: first the front one and on this occaison the rear one. I secured both using blue locktite on the set screws. But I'm not sure if it was the outdrives coming free that caused the dog bone to pop out or the wear shown in the picture. Thoughts?