My Cayman keeps locking . . . on its own.

I talked to the service manager and he asked me if my garage were close to the kitchen because the microwave might lock the car. (The garage and the kitchen are right beside each other.) But I've run the microwave and it has not locked the car. I've made sure not to run the microwave and the car gets locked. (The service manager thinks I'm nuts. Maybe I am.

)