Spotify shuts down if WiFi is OFF and Wired is ON

[i2yolo]

If WiFi is turned OFF and Wired is turned ON, or

If WiFi is turned ON and Wired is turned OFF:

Spotify turns off immediately after I turn it on.

I turned on Spotify by using a terminal and the result is:

Gtk-Message: Failed to load module "gail"
Gtk-Message: Failed to load module "atk-bridge"
Gtk-Message: Failed to load module "canberra-gtk-module"
terminate called after throwing an instance of 'boost::exception_detail::clone_impl<boost::exception_detail::error_info_injector<boost::system::system_error> >'
  what():  set_option: Cannot assign requested address
Aborted (core dumped)

If WiFi is turned on and Wired is turned on (the LAN cable can be uconnected): Spotify works perfectly. Terminal result is:

Gtk-Message: Failed to load module "gail"
Gtk-Message: Failed to load module "atk-bridge"
Gtk-Message: Failed to load module "canberra-gtk-module"
(( Spotify not shutting down itself ))

It happens on my Desktop PC with Ubuntu 18.04.