Pi Musicbox suddenly stops with no warnings in logfiles

I use the Pi Musicbox on my RPI2B.

Sometimes the device suddenly stops working. At that point I cannot reach the device using the web interface, MPD-app and SSH.

I did put logging on DEBUG and I do not see any warnings or abnormal debug-messages before the device stops working. It is like it suddenly doesn’t exist anymore.

Unplugging and replugging power solves it,

Same for monit.log (see below):
[CEST Sep 3 01:17:25] error : Error: Could not execute /etc/init.d/ntp
[CEST Sep 3 01:17:56] error : ‘ntpd’ failed to start
[CEST Sep 3 01:19:56] error : ‘ntpd’ process is not running
[CEST Sep 3 01:19:56] info : ‘ntpd’ trying to restart
[CEST Sep 3 01:19:56] info : ‘ntpd’ start: /etc/init.d/ntp
[CEST Sep 3 01:19:56] error : Error: Could not execute /etc/init.d/ntp
[CEST Sep 3 01:20:26] error : ‘ntpd’ failed to start
[CEST Sep 3 01:17:16] info : Starting monit daemon
[CEST Sep 3 01:17:16] info : Monit start delay set – pause for 300s
[CEST Sep 3 14:47:53] info : ‘system_BOOM’ Monit started
[CEST Sep 3 14:47:53] error : ‘ntpd’ process is not running
[CEST Sep 3 14:47:53] info : ‘ntpd’ trying to restart
[CEST Sep 3 14:47:53] info : ‘ntpd’ start: /etc/init.d/ntp
[CEST Sep 3 14:47:53] error : Error: Could not execute /etc/init.d/ntp

The logfile “boot” and several files in the “samba” folder have activity a few minutes before it all went silent.

boot: http://pastebin.com/9HtibGCA

Is there anything I can do to provide more info end/or solve this?

(Many thanks for your answer)

NB: I am a bit of a NOOB when it concerns linux and logfiles.

Is it using wifi? In my limited experience, problems with music dropping out are quite often caused by a duff wifi adapter.

No wifi-adapter in my pi. All is cabled.
It should also not stop logging when only the network is unplugged.