I agree with Seth. The battery would be my first suspect, especially if it is the stock one. I, and others, have mysterious drains also. Mine sat all week and I had to jump it off and I have a "good" optima battery in it.
There is something about relays waking up or locking on and draining the battery and it is an intermittent problem. Good luck tracking it down. My cure is going to be adding a second battery.
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