You should check if you have single or tantdem rollers on the sliding doors. Most sliding doors are installed with single rollers, which tend to ware quickly because of the construction debris that is left on the track. If the doors have only one roller at each side, have the rollers replaced with two, tandem rollers. Tandem rollers are built like the wheels on a trolley car or train. They distribute the weight better and the doors will slide with much less effort.
Click here for more info....
https://www.amazon.com/Prime-Line-Pr...00A6G7PHO?th=1