I've got at least four ships that had to be magnetized because the bit on the ship that inserts into the peg has been snapped clean off...
I had 3 of the 4 ties that came with the Goz do that. I was able to glue them back on, and I think it was the glue that was the issue. But in two cases all I did was bump them and they popped off... Leaving the socket in the tube you attach to the goz.