How to stop render falling off?

Could you please explain, how do we prevent render from falling off? I've noticed in some of our recent projects that the render seems to be peeling off or cracking, and I'm really concerned about the durability and quality of our final outcomes. Could you share with me any techniques or best practices we could adopt to ensure a smoother, more consistent render application? I'm interested in both the preparation steps before applying the render, as well as any post-application care or maintenance tips that could help us avoid this issue in the future. Thank you in advance for your insights and guidance on this matter.