Knightdale sits in a cold-moderate climate band, which means the garage sees real swings - summer heat that pushes lubricant out of a spring coil, winter cold that stiffens it back down, over and over, year after year. On a door that's been cycling through that swing since 2006, dried-out lubrication on the torsion spring and hinges is the single most common thing we find on a maintenance visit here, and it's also the easiest one to miss until the door starts groaning.
The other factor is who's living behind these doors. Knightdale's median household income runs close to $91,638, well above the wider service area's median, and most of these are owner-occupied houses where the door gets used daily by the people who own it - multiple cycles a day, not a once-a-week landlord check-in. More daily use means spring fatigue and roller wear show up on a tighter schedule than they would on a door that barely gets touched.
Put those two things together - a climate that dries out lubricant on a cycle, and hardware that's been cycling hard since the mid-2000s - and you get a door that looks fine until the spring gives out with no warning.