2001 Jaguar S-Type Central locking

I own a 2001 Jaguar S type and for some reason the central locking and alarm system wont work with the key fob. It locks the car and the car alarm beeps but then it automatically re opens all the doors. I can lock the car with the key in the drivers door and all is fine it is just with the remote key fob. Also as you drive off the doors automatically lock as they have always done but now they lock and re open straight away. I have disconnected the battery and the problem is still there, can anyone help. Thanks