Central locking, locking me in my car :(

[Tom]

Its like the title says everyone, basically my central locking keeps just locking by itself so i get locked in the car and earlier i was moving cars around and left mine running shut the door and when i came to move it my keys were locked inside with the engine running, luckily my electric window is knackered so i shoved the window down and got in, But anyone else had this problem or knows how i can fix it?