Hello,
Do you have pictures you can post? Delamination is often caused by water intrusion and the wood expanding and just falling apart. Which slide is it, for example my bedroom has 3 rollers for each slide. In the case of the main kitchen slide are are much larger main rollers and smaller ones near the ends, the large ones are framed in steel and harder to see by the seal.
A call to Heartland service might yield some trouble shooting tips, being a 2018 might still be under warranty. Have your VIN ready as well.
Brian