I’ve had Sunline braid on my lure reel for many years now.
It’s never let me down but every now and then you do lose some length.
It might be because of a snag, tying a new swivel or a wind knot.
In my case, a combination of all three meant that it was time to replace the line.
When casting isn’t as fluid as it used to be, you know it’s time for a change.