2000 Clio-Open door with key,lift handle,locks on other doors no longer pop?

I've been using the key to unlock the driver and or passenger door. Normally, once I lift the door handle on drive/passenger door, all the other doors would unlock. However this is stopped work. Only the drive/passenger door open now, i.e which ever one I unlock with the key. I've have to unlock them from inside car, using button by gear stick