Have your key fobs checked out by the dealership. The same thing happened to my wifes Z twice in the middle of the night. I told her it was because of all the crap she has in her purse. The service manager at the dealership where she works tested the key fobs, and found that the spare one(mine) was intermittently sending signals out to unlock the car. They replaced the fob and so far there hasn't been a recurrence of the problem.
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