We'd like to assist with the your dishwasher's lower rack not staying on the rails. It's extremely important that you don't overload your dishwasher racks when loading dishes. Our dishwasher upper racks are life-tested to handle a 30 lb. load; Lower racks are tested to handle a 50 lb. load. You can find information about loading your dishwasher on pages 11-15 of the owner's manual here: https://images.salsify.com/image/upload/s--EszXjA26--/2ee1c206fc195cd1717cedf8b41e2ab95579670c.pdf. If this doesn't help, the next step we recommend is to uninstall and reinstall the lower rack to ensure its in place on the support rails. If the issue continues, we recommend scheduling service with our Bodewell team by calling 1-833-426-3393 or online here: https://www.geappliances.com/ge/service-and-support/service.htm.