Are you sure it's a dedicated circuit off your electrical panel? Sounds to me like something else on the circuit is drawing load at 2 and 5:30PM.
Is the wire being run close to, or touching any other lines in parallel? Electrical fields can have an effect on parallel lines.
Are you using the proper size/type of wire? Oversized or undersized can cause faults.
20A GFI's are designed for use as kitchen counter plugs, do you have a 15A GFI you could change it out with to test?
If all else fails you could try to PM mike31154, he's a Sparky and may be able to help.
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