I accessed the log via /dev page.
First I disabled Spotify Connect 2 plugin, then I rebooted Volumio and after coming back I re-enabled the plugin again.
Here is the log:
Starting Live Log…
info: ------------------------------ 1356ms
info: CoreCommandRouter::volumioGetState
info: CorePlayQueue::getTrack 0
info: CoreCommandRouter::volumioGetQueue
info: CoreStateMachine::getQueue
info: CorePlayQueue::getQueue
info: CoreCommandRouter::executeOnPlugin: system , getHwuuid
info: CALLMETHOD: system_controller system enableLiveLog true
info: CoreCommandRouter::executeOnPlugin: system , enableLiveLog
info: Launching a new LiveLog session
volumio : TTY=unknown ; PWD=/ ; USER=root ; COMMAND=/sbin/ifconfig eth0
pam_unix(sudo:session): session opened for user root by (uid=0)
pam_unix(sudo:session): session closed for user root
volumio : TTY=unknown ; PWD=/ ; USER=root ; COMMAND=/sbin/ifconfig wlan0
pam_unix(sudo:session): session opened for user root by (uid=0)
pam_unix(sudo:session): session closed for user root
volumio : TTY=unknown ; PWD=/ ; USER=root ; COMMAND=/sbin/ifconfig eth0
pam_unix(sudo:session): session opened for user root by (uid=0)
pam_unix(sudo:session): session closed for user root
volumio : TTY=unknown ; PWD=/ ; USER=root ; COMMAND=/sbin/ifconfig wlan0
pam_unix(sudo:session): session opened for user root by (uid=0)
pam_unix(sudo:session): session closed for user root
info: CoreCommandRouter::volumioGetState
info: CorePlayQueue::getTrack 0
info: CoreCommandRouter::executeOnPlugin: multiroom , getMultiroom
info: Listing playlists
info: CoreCommandRouter::executeOnPlugin: appearance , getUiSettings
info: CoreCommandRouter::executeOnPlugin: wizard , getShowWizard
info: CoreCommandRouter::executeOnPlugin: system , getShowWizard
info: CoreCommandRouter::executeOnPlugin: system , getPrivacySettings
info: CoreCommandRouter::executeOnPlugin: my_volumio , getMyVolumioStatus
info: CoreCommandRouter::volumioGetQueue
info: CoreStateMachine::getQueue
info: CorePlayQueue::getQueue
info: CoreCommandRouter::volumioGetVisibleSources
info: CoreCommandRouter::executeOnPlugin: my_music , getDisabledSources
info: CoreCommandRouter::executeOnPlugin: my_volumio , detectVolumioHardware
info: Could not detect Volumio Device: Error: Command failed: aplay -l | grep es90x8q2m-dac-dai-0
[SpotifyConnect] Stopping Vollibrespot daemon
[SpotifyConnect] Closing metadata listener
info: Disabling plugin volspotconnect2
info: Done.
volumio : TTY=unknown ; PWD=/ ; USER=root ; COMMAND=/bin/systemctl stop volspotconnect2.service
pam_unix(sudo:session): session opened for user root by (uid=0)
Stopping Volspotconnect2 Daemon…
Stopped Volspotconnect2 Daemon.
pam_unix(sudo:session): session closed for user root
[SpotifyConnect] Vollibrespot Daemon service stoped!
info: ___________ PLUGINS: Run onVolumioReboot Tasks ___________
info: PLUGIN onReboot : networkfs
volumio : TTY=unknown ; PWD=/ ; USER=root ; COMMAND=/bin/umount -f /mnt/NAS/NASuGarazi
pam_unix(sudo:session): session opened for user root by (uid=0)
pam_unix(sudo:session): session closed for user root
volumio : TTY=unknown ; PWD=/ ; USER=root ; COMMAND=/bin/systemctl reboot
pam_unix(sudo:session): session opened for user root by (uid=0)
Started Turns off Raspberry Pi display backlight on shutdown/reboot.
Started Synchronise Hardware Clock to System Clock.
Stopping Bluetooth.
Stopped target Bluetooth.
Stopping system-ifup.slice.
Removed slice system-ifup.slice.
Stopping system-systemd\x2dfsck.slice.
Removed slice system-systemd\x2dfsck.slice.
Stopping Spotify Daemon…
Stopping dhcpd.service…
Stopping Host and Network Name Lookups.
Stopped target Host and Network Name Lookups.
Stopping dnsmasq.service…
Stopping Authenticate and Authorize Users to Run Privileged Tasks…
Stopping Disk Manager (legacy version)…
Stopping Bluetooth service…
Stopping Graphical Interface.
Stopped target Graphical Interface.
Stopping Entropy daemon using the HAVEGE algorithm…
Stopping Multi-User System.
Stopped target Multi-User System.
Stopping mount disks automatically with standby…
Stopping UPnP Renderer front-end to MPD…
Stopping volumio-remote-updater.service…
Stopping Volumio Streaming Daemon…
Stopping Volumio Log Rotation Service…
Stopping OpenBSD Secure Shell server…
Stopping Login Prompts.
Stopped target Login Prompts.
Stopping Getty on tty1…
Stopping Login Service…
Stopping LSB: start Winbind daemon…
Stopping LSB: start Samba SMB/CIFS daemon (smbd)…
exiting on receipt of SIGTERM
Terminating
Received signal 15; terminating.
Stopping SDP server
Exit
Stopping LSB: start Samba daemons for the AD DC…
Stopping LSB: Start NTP daemon…
Stopping LSB: Brings up/down network automatically…
haveged: Stopping due to signal 15
haveged starting up
Stopping LSB: Advanced IEEE 802.11 management daemon…
Stopping LSB: set CPUFreq kernel parameters…
[2020/07/09 23:08:11.261966, 0] …/lib/util/pidfile.c:153(pidfile_unlink)
Failed to delete pidfile /var/run/samba/smbd.pid. Error was No such file or directory
Stopping Shairport Sync - AirPlay Audio Receiver…
Stopping Music Player Daemon…
Stopping D-Bus System Message Bus…
Starting Store Sound Card State…
Disconnected from D-Bus, exiting.
Got SIGTERM, quitting.
Leaving mDNS multicast group on interface wlan0.IPv4 with address 192.168.211.1.
Leaving mDNS multicast group on interface eth0.IPv4 with address 192.168.1.10.
ntpd exiting on signal 15
avahi-daemon 0.6.31 exiting.
Stopping NTP server: ntpd.
Exiting.
Discovery: ERRORError: dns service error: unknown
info: mDNS Advertisement raised the following error Error: dns service error: unknown
info: mDNS Browse raised the following error Error: dns service error: unknown
haveged.service: main process exited, code=exited, status=143/n/a
Stopped Entropy daemon using the HAVEGE algorithm.
Unit haveged.service entered failed state.
Stopped mount disks automatically with standby.
Stopped volumio-remote-updater.service.
Stopped Volumio Log Rotation Service.
Stopped Login Service.
Stopped Avahi mDNS/DNS-SD Stack.
Stopped D-Bus System Message Bus.
Stopped OpenBSD Secure Shell server.
Stopped Disk Manager (legacy version).
Stopped Getty on tty1.
Stopped Authenticate and Authorize Users to Run Privileged Tasks.
Stopped Bluetooth service.
Stopped dnsmasq.service.
Stopped dhcpd.service.
Stopped Spotify Daemon.
Stopped UPnP Renderer front-end to MPD.
Stopped Shairport Sync - AirPlay Audio Receiver.
Stopped Volumio Streaming Daemon.
Stopped LSB: Start NTP daemon.
Stopped LSB: Advanced IEEE 802.11 management daemon.
Stopped LSB: set CPUFreq kernel parameters.
Stopped Music Player Daemon.
Started Store Sound Card State.
Network Interface Plugging Daemon…stop eth0…done.
Stopped LSB: Brings up/down network automatically.