This area sits in a cold, moderate climate band, which means freeze-thaw cycling on the slab and the track brackets through the winter months. On an older door that's mostly a spring issue. On the newer stock more common in Oak Grove, it shows up differently - thin steel track brackets flex slightly with temperature swings over the years, and screws that held tight in 1984 work loose a little more each winter. Add a roller that's worn past its lip, and the door doesn't come off the track in one dramatic event - it walks off gradually, a sixteenth of an inch at a time, until one day it jumps the channel entirely. That's the pattern we see more on this side of the territory: gradual bracket loosening compounding with roller wear, rather than a single sudden hardware failure.