How old is your spinnaker? More than a season I bet - its blown out, get a new one.
Haha if money was no issue I would get a new one right aaway, but as most of us, I sail with a budget. Don't you have this problem? No, without kidding, the spinaker is fine, not blown out, but 25 sqm. is a lot on a single line!
A second ratchetblock is worth trying, I have a spare one lying around.