I am periodically having problems with the key system not detecting my key, and therefore, not allowing me to lock the car using the lock button on the remote. Here is what happens. I put the car in park and push the button to turn the car off. I get out of the car and close the door. When I push the lock button, there is a long steady tone. I open the door and get back in, and the display is showing key not detected. In this instance, I had the key with me and in fact it I was holding it in my hand. This situation actually happened when my car was in for service at the dealer, but it seems that my dealer has only one person who has knowledge of the smart key system and that person just happened to not be there. This is not the first time where the key system can't detect the key. Any ideas on what is going on?