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The A/C relay field coil is provided a power and a ground thru terminals 1 and 3.
Power and ground excite the relay coil and the electromagnetic feild produced by the coil close the contacts of the relay completing/engaging the intended circuit...
So your problem is intermittent... That definitely says an electrical issue.
I posted info on 2g turbo a/c here
Not the same issue in that thread but a/c compressor clutch...
That is a pretty rapid cycle of the clutch.
Your going to need to test the a/c clutch relay control circuit.
The relay in the underhood fuse box provides power to turn clutch on.The relay itself is an electrically controlled switch.