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Hello and welcome to JustAnswer! This is James, I'm a Pool & Spa Engineer with over 20 years of experience, and I'll be assisting you today.
So you believe its deflating (not losing water)?
How many hours does it take before you notice its lost its structure \ pressure?
Right then its likely to be a pin hole in the liner.
They are a real pain to locate the best thing I find is to inflate them with no water in them, get some soapy water and a rag, and wipe over the liner with a soapy wet rag slowly, you will see the bubbles blow up and that should allow you to locate it but make sure the liner is fully inflated.
From my own experience I find the patching of the holes is a real problem, and if your leak is around a stress area (handle or where the hoses go in) the its a new liner as the patches will not hold.