I am having the same problem. Have a 2014 with keyless proximity unlock and ignition (push button). It happens to me intermittently. Have ignition off, get out and press the lock button on the armrest, close driver door, walk about 5 to 10 feet, then three beeps to notify me that it has unlocked itself. Also, as just happened, got into vehicle, pressed the lock button on armrest, started to press ignition button to start engine, as I was reaching for ignition button it beeped three times and sure enough the door was now unlocked with me seated in the driver seat. Relocked it, started engine without any further problem. Have tried several different sequences to see if I could identify any pattern. No noticeable pattern as to when it will happen and never happens twice in a row. Definitely time to see the dealer about this annoying problem.