Most common cause: people use 50# braid and sock the drag way down. Mono leaders stretch and get compromised before the braided running line. The clinch knot is the weakest link, so that's what fails.
A clinch knot with 4 or 5 neat wraps should hold on 50# leader material so long as you don't have 30 or 40 pounds of drag pressure. The improved clinch does not seem to hold as well with heavy leader material.
Neat wraps, a fully tightened knot, not too much drag, and re-tying the knot after an hour or so of continous casting should be on the checklist. The pressure from snap casting when using spinning degrades a knot's breaking strength after a while.
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