Glenn Heights is one of 13 named areas in this part of the county that mostly built out in the 1980s and 90s surge, with Glenn Heights itself landing right at the tail end of that run around 2000. The hardware that went in during that period was decent for its time, but it's aging out on a schedule, not randomly, and that schedule is now.
The climate here sits in a moderate heat band, not the extreme swings some regions deal with, but even moderate heat cycles dry out spring lubricant and shrink the foam door seals over two decades. On a door installed in 2000, that's twenty-plus summers of expansion and contraction working on the same weatherstripping and the same grease. It doesn't blow out all at once. It gets stiff, then noisy, then it fails on a Tuesday morning when someone's already late.
With 5,734 households in Glenn Heights, that means a real cluster of doors is hitting the same wear point around the same few years, which is different from an area with houses spread across five decades of construction. One honest limitation: we can't predict exactly which spring on which door goes first, only that the fleet as a whole is in the window where it happens.