MPD on localhost won't work if there's no Wifi!?

[Teresa e Junior <teresaejunior@gmail.com>]

Hello to all!

I've had this problem with previous versions of MPD, and now I'm using 
0.18.7, but the problem persists. This is an odd situation: MPD is 
configured to run on 127.0.0.1, but if the Wifi is disconnected in 
NetworkManager, it starts spitting error messages and refuses to play:

$ mpc
error: Failed to resolve host name
$ ncmpcpp
error: Failed to resolve host name
$ MPD_HOST=127.0.0.1 mpc
error: Failed to resolve host name

$ cat /etc/hostname
localhost
$ cat /etc/hosts
127.0.0.1 localhost

$ egrep -v '^#|^$' .mpd/mpd.conf
music_directory      "~/.mpd/database"
playlist_directory   "~/.mpd/playlists"
db_file              "~/.mpd/tag_cache"
pid_file             "~/.mpd/pid"
state_file           "~/.mpd/state"
bind_to_address      "127.0.0.1"
audio_output {
    type             "pulse"
    name             "My Pulse Output"
}
mixer_type           "software"
max_playlist_length  "32768"
filesystem_charset   "UTF-8"
id3v1_encoding       "UTF-8"

The only thing I noticed is that NetworkManager erases /etc/resolv.conf 
when disconnected, but I tried writing to resolv.conf myself, and it 
didn't help. But If I reconnect the Wifi, I can play music again. The 
network is very unstable where I am today, so I can't play music often.

I have also tried this, but it doesn't make any difference:
bind_to_address      "localhost"

I have asked for help at http://forum.musicpd.org/, but they said 
something is not right in my network, and I believe that could be 
actually the case.

Thank you for your attention!
Teresa and Junior