Marianne -

The only reason I know is beacuse I was out delivering cookies (from my kids fundraiser) and hopped out with the smartkey in my pocket and the TCH still on and it protested. When I tried to press the button on the door handle to lock it it gave me a very long (and quite loud) "beep" (more of a tone really) and did not lock.

I can see how it can happen!

Scott