Maybe ther line you're using is old and brittle. Try soaking it for about 24 hours in a bucket of water. Just set the entire spool down in and make sure it is totally submersed. It works wonders at restoring brittle line, and many line manu's recommend doing so.
Also, make sure you don't wind the line too tightly. Don't leave it loose and sloppy on the spool, but many guys wind it too tightly and have feeding and breaking issues with it.