Problem with locks

First of all i want to wish you all a happy new year.

I have a year 2002 fabia 1.4 16V which has a problem with the central locking(no remote control).

The doors lock and unlock whenever they want and mainly when i close the driver's door.

The key and the locking button on the door lock and unlock with no problem.

At first it was an intermittant problem but now it happens all the time and i am afraid of locking me outside with the keys inside.

Is there someone else with this problem ?

Anyone got any ideas what is wrong ?

I tried to open the driver's door panel if there is a bad wire connection but i couldn't pull off the inner metal sheet of the door.

How can i pull it off?

Hello from Greece