This part of the service area sits in a moderate heat climate band, and while that's milder than the extremes some regions get, it still means decades of daily expansion and contraction on metal track and hardware. On a door installed around 1978, that's close to fifty years of a track system heating up and cooling down, enough to walk lag bolts loose in the jamb and work spring cones slightly out of true even without a dramatic failure.
Yucaipa contributes 18,006 of the roughly quarter-million households across the territory we run trucks through from Moreno Valley, and it sits about twelve miles out along that route. The age of the stock here, not the distance, is what drives most of the calls - a 1978 build with its original hardware is simply further down the wear curve than a house finished in the 1990s. Heat cycling doesn't break a door on its own, but it's steadily loosening the bolts that are holding everything else together.