The door usually doesn't come off the track all at once. It starts with a scrape or a grinding sound on one side as it opens, a slight lean where one corner sits lower than the other, or a roller visibly hanging outside the channel instead of inside it. Sometimes it's subtler - the door looks fine shut, but halfway up it starts to bind and the opener strains or reverses.
Across the service area - Kennewick itself, West Pasco, Pasco, Finley, Burbank, West Richland, Benton City, and Riverview - we see the same pattern on doors from the same era: a track bracket that's worked loose over years of temperature swings, a roller that's finally worn through, or a cable that's stretched just enough to pull the door crooked on its way up.
If you catch it at the scraping stage, it's almost always a bracket or roller fix. If you wait until the door is visibly hanging at an angle, you're more likely looking at a bent track or a damaged panel on top of it.