Pzmaria,
Good afternoon! I've had a few friends who were dealing with the same problem, and it seemed, for one of them, that the actual turnbuckle that connects the lifeline to the bow pulpit was causing the issue, because a small safety pin was catching the dacron stitching on the foot and ripping it loose. Also, I have seen a conversion kit for Catalina 30s for the lifelines; on the Catalina 25, they produced the boat with lifelines that went from the forwardmost stanchion down to the foredeck just in front of the pulpit (as seen in Jeppbleutj's picture). This conversion is available for the 30, but I've never seen it on any other boat besides my friend's. Like the others stated, a patch of leather or Gorilla Tape works fine for a while.
Hope this helps!
God Bless,
S.S.