Correct me if i am wrong, but can't ANY liner slip out of place? Mine seems Ok, though perhaps not perfect. It is pretty great looking considering DH and I installed the pool ourselves, from the ground up, with very few written instructions to follow. We had NO experience, just made up our minds and did it! I had wanted a pool all my life, and he did all the ground prep for me. Fortunately, he works for a marine construction company, and could borrow all the equipment we needed for free, AND he knew how to use it!!! LOL! But liners age, and do not stay "stable" for their entire life span right? I mean, ground shifts, water shifts, temperature changes.......won't they all affect how the liner "behaves"??? I would think most liner problems would come with old age (ahem!) and shrinking when pool is dry. Am i on the right path here?