Why am I having constant problems with my evap system? on 2001 Dodge Neon

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I have had it "fixed" 5 times in the last two years and my engine light still comes on. I get it fixed and is good for about 2 weeks and then I her a small hiss and pop and then the light is back on. It started with a small leak and has gone up to a large leak. Is there some kind of blockage or something else causing this?
(2) Answers
(1) Comments
you need a new shop familiar with repairing these systems. evaps are difficult to diag but should not give you that much problems.

Thanks, but not really the answer I was looking for. I have been to two very reliable shops, that have replaced a pump, hoses,and hose clamps, even the gas cap, but the hoses still keep popping off. I guess my question should be why are the hoses popping off? Is there some kind of release valve that might be stuck, or would it be a blockage in a hose?