Torsion springs fail from cycle fatigue, and heat speeds that along. This area sits in a moderate heat band, not the extreme swings you get further south or in the desert, but garages here still run hot enough through the summer to dry out spring lubrication faster than a shaded, cooler climate would. Combine that with a door built in the early-to-mid 2000s, most of which are now fifteen to twenty years into service, and you get a spring that's simply worn through its coil life rather than one that snapped from a single bad event. Murphy's median household income, $165,109, runs well above the $110,357 median across the broader service area, and that tracks with what we see on the doors themselves - more insulated steel and composite panels, which weigh more and put more ongoing load on the spring than a bare single-layer door. Heavier door, same age, same moderate heat - that combination is the pattern here, not one dramatic cause but steady wear finally catching up.