Sorry if you already know it
Pay attention keeping the advanced key in the same pocket of your phone.
I have an iPhone 5 and If I keep it in the pocket together with the advanced key, the doors do not open until I move the phone away.
And worse, yesterday I was driving and the key was in the pocket together with the iPhone. At a certain point I started hearing a clicking noise from the loudspeaker, something like a radio digital interference of something trying to send data packets.
After few minutes the yellow triangle lit on the dashboard and the DIS told me that the key was not in the car
I then realized about the phone and immediately moved it away from the key. Immediately the clicking noise faded away and the alert on the DIS went away.
So pay attention to interferences between the advanced key and cellphones :D