The doors on my 2004 Corolla intermittently lock by themself. It never happens when I'm driving only after I park the car, remove the keys and exit. It's usually 10 to 15 seconds or more after I exit. Sometimes it's after I close the trunk. I've swithced remotes and it still does the same thing. It may happen several times in one day and then not happen again for a week or so. Any suggestions would be apreciated. Thanks.

I believe it to be an anti-theft device. If left unattended for a period of time, with no key in the ignition, the car will self lock. Great idea!!