@Tony Thanks for your reply. I did forget the twos WIFI Networks but it did'nt change the behaviour : I tried to connect to SSID2, type in wifi password, it took a couple of minutes and I recovered...

Hello, In order to extend my WIFI coverage I have recently added a new Access Point to my installation. As I had a spare TD-W8960N I decided to use it for this only purpose (I followed the guidelines...