I have a 04 T and the wife has a 07 Murano. We both have the factory power lock key fob. I notice that the T sometimes locks itself if I take the keys out and walk away without manually hitting the lock button. The wife has noticed this also every now and then, but not on a regular basis. Is this normal? Will it lock itself if the keys are left in? I thought this only happened on the new Nissan's that have a "smart key".