Because springs are high cycle steel living in salt air. Every open and close works the coils, and corrosion pits the wire between cycles, so a spring's life here is set by seasons of salt exposure as much as by cycle count. The visible signs are rust dust under the spring, orange streaking at the coils, and a door growing heavier at the bottom of travel. The professional answer is a matched pair in a corrosion resistant finish, sized to the door, and a fall inspection that reads the springs before the brittle cold weeks, when failures cluster.
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