1999 Other Nissan Models central locking

Hi, I have a 1999 nissan micra 1.3 gx, and it has a prob with the central locking. The drivers door is opened by the key fob, and istantly relocks itself and the other doors. Sometimes the doors lock themselves when I am inside the vehicle. Just recently, the drivers door does not lock on occasions, but the other doors lock. Any feedback would be gladly appreciated. Thankyou.