Aging springs and openers
That means a lot of original torsion springs long past their wind count, steel sectional doors with rollers that were never replaced, and openers from an earlier generation of chain-drive hardware that's simply worn out. Our climate here is mild with only occasional freeze risk, so we don't see the frozen-track calls you'd get further north - what we see instead is UV and humidity wear on seals, weatherstripping gone brittle, and tracks that have pulled loose from slow settling over decades.