Trimmer Line Breaking? Soak it in water! Believe it or not Nylon trimmer line is Hygroscopic.
Trimmer line will lose moister and become brittle over the winter. Before the season starts drop that old spool of line in a bucket of water and let it sit. You will be surprised how it will help, works great for your fishing line to.
Also, if you find .065 or .080 line isn’t lasting long. I’ve modified my spools to accept .095 line. What a difference in its longevity!