Last arrow: Never had any break in the loop. As I reported earlier never had any strings break at all. However, that's a good place for dirt and grit to begin working on the string. Particularly the bottom loop. Also, sometimes the string grooves on some bows are a little rough and can begin to eat away at the string. Either of these, I suspect, would lead to the string breaking at the lower/affected nock if not addressed. That's why I change strings if I see a few strands cut/frayed in the nock loop(s).