Thanks, cornytheclown !! This looks like a simple, straightforward answer
!! All that I need to do is to lubricate the track a bit. There is
nothing wrong with the door or the rollers....... the door doesn't stick....
..it just needs lubing. I am 100% sure of it.... just didn't know what
was the best product that might last a little while.

Out of all the answers, I think the graphite suggestion and the parrafin wax
are the most inviting....


Thanks to all who responded !!


James