One other possibility is that the opener is on the original or default code set and that other people with similar garage door openers and remotes also set to the original code set are accidentally or purposefully opening your garage with them. A guy I know was once a car salesman at a small dealership and would routinely test drive cars people were trying to trade in. If he saw a remote control in the car, he'd always try it as he went by one particular house and he claimed that about one time in five, it would open the garage door. Just a possibility, but you could try reprogramming the opener and remote to a new set of codes.
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