The corner stays are a wear part much like the tires on your car or bike and will eventually need to be replaced. We sell replacements here.
AND/OR: One or more of your stays may be damaged from overuse or improper installation. To check, remove stay from sleeve. If the stay has a crease in it, the spring steel under the rubber coating is damaged. We sell replacements here.
AND/OR: Do you require more structural support in the stays (ie you’re stacking multiple 70Ls with heavy loads?). A nifty trick we do is doubling up stays in each corner, adding extra rigidity to the 70L. We sell extra stays here.