Not sure if this applies to the newer Fusions, but when I worked at Ford a few years back, the 1st gen fusions had a similar problem.
when cars came in with this issue, we would unbolt the slide frame from the lower frame, de-burr the edges of the holes (Do Not Enlarge the Holes!)
lay down a small amount of white lithium grease on the track mating surfaces and tighten the frame down, worked something like 75% of the time.
worth a shot