i had 3 spools of line break halfway on a full spool using triline xl and flourocarbon in 12 14 and 10 # test and dont know why?? any ideas why?

Did they break under pressure, on a cast, backlash?

If you were trying to pull ut a backlash and kinked the line it would also cause this.

I'd start by taking a cotton ball or q-tip and running it around each eye on your rod. If you have cuts in the eye it can cause weak spots in line.

Are you trying to connect two lines together by splicing them and casting to that point? I'd try an albright knot if so.