Your experience is so close to ours it’s eerie! Just paid big bugs to have our 120 foot line to county main rodded out, after 20 years with NO problems. The paper formed a big wad near the end of the line, we couldn’t figure out what happened until your (and other) posts. Taking back what’s left of the package, and considering a small claims lawsuit.
Thank you for alerting us to the problem – will never use the product again!