Can't connect my Node2i to my network

Hi, I am the happy owner of a Bluesound Node2i. It worked perfectly for two years, but suddenly i can't connect to wifi anymore ! I don't understand because it worked so well before ! I tried restarting the Node, turning off my router, but nothing works. I tried to connect my bluesound by ethernet (the blue light is here with ethernet) but it doesn't work either ! What can i do ? It is very frustrating. Thanks !