Munds Park's houses run older, on average, than the broader Sedona service area. The area centers on homes built around 1985, a couple years ahead of the wider service area's 1987 median. That gap sounds small until you're standing under the opener rail. It means more of the units up here are original equipment, chain-drive motors from the mid-80s with worn nylon gears and stretched chain, still limping along on the same bracket they shipped with.
Add in the climate. Munds Park sits in the region's cold-moderate band, and cold does specific damage to an opener that a mild valley garage never sees. Grease thickens, plastic gears go brittle, and a motor that starts fine on a warm afternoon can grind and stall on a cold morning. That's a different failure pattern than what shows up on a newer 1990s-stock door closer to town.
With roughly 455 households out here, this isn't a high-volume area for us, but the pattern repeats house to house because the building stock is so consistent. If your opener is original to the house, it's not a maintenance question anymore. It's a replacement question.