Sounds like you could have a faulty door handle. Mine does the same, even to a point where if you walk up to the car some days it will unlock as you get close. I need to find time to get mine booked in to get it sorted out.
One other thing to watch out for, make sure it locks and stay's locked. Once your outside of the proximity sensor it's fine. I have my mirrors set to fold as the car is locked and noticed a few times the mirrors fold then unfold straight away.
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