Replace or repair liner?

Covered my above ground pool on Labor Day and the pool immediately began leaking. It has done this every year and stopped shortly afterwards. But this year it has continued to leak. We were out of town for a weekend and it dropped down a couple of feet so I stopped refilling it. The liner is 6 years old and I'm thinking this dictates replacement. Any thoughts are appreciated.

Do you see any wet ground around the pool? Does it stop leaking when the water gets to the same level as in years before? Usually when the water level stops dropping, you can look right around the surface for your leak problem.