sliding glass door is difficult to slide
 

Help
I am having trouble opening and closing my sliding glass door. Does anyone have any suggestions of something that will help the glass slide easily?

Using some candle wax may help but you're probably going to have to find where it's binding. The wheels may be bad at the bottom or the track may be bent.

The wheels do wear out. When they do, sometimes the edge breaks off and then it won't stay on the track.

Derailed, like a train wreck.