Another big factor in shortening the lifespan of the rollers is dirt and pet hair. The track area of the patio sliding door is very prone to the collection of muck and dirt. This dirt and muck in turn get drawn into the bearings of the rollers causing them to seize up.
Dog hair is the worst offender. Weight is also a big factor. The weight of the door can shorten the life of the patio rollers.
Older sliding patio doors tend to have “plate” glass, which is much heavier than glass used in modern double glazing.