Matrix element I , can't connect to wifi

[Konstantinos]

Hi, my element i won't connect to my new WiFi network anymore. When I press the nob for a while the icon appears that the device is in WiFi pairing mode but the matrix auto config option doesn't appear in the available networks to connect. I have tried so far:
- to update the firmware
- to use a different android phone
- update the app
- reset the device
- re connect the WiFi antenna

Any help please....