I use 8# PP A couple isssue that are actually operator error but blamed on the line, I think, are as follow.
1st, filling the spool too far. This along with the light subtle braid will cause twists/knots in the line during cast, the line will catch on itself and pull an amount off with it.
2nd, loops over the spool if bail not closed by hand. A little piece of line will not lay on the spool but go over it and on next cast or so the line going out will catch and twist/knot formed in line.
So close bail by hand and dont overfill spool.