Thanks Rich.M for heading us in the right direction. Always figured it was a slide out alignment and was reluctant to take it in under a warranty claim.
Our left side was really bad and the plywood backer and trim were barely holding on. Finally tackled the problem before the slide out was outside the rear of the RV.
After carefully removing the decorative trim with a stiff putty knife it exposed the plywood backer on left, center and right side. The few sheet metal screws used were a poor choice for the amount of pressure placed by the Schwintek slide mechanism. The aluminum frame is thin walled and coarse sheet metal threads don't hold. The only way mine was going to hold was by drilling and tapping, then using stainless steel flathead screws.
Drilling/countersinking right side
Tapping left side
Left side completed (spaced about every 4")
Stainless steel screws used