After reboot, no music and log : No database

Hello,
I am having an issue, after a boot, more than half the time, my USB key is not visible in Browse/ Music Library and artists and albums are empty.
I need to reboot, sometimes several times and USB Key become again visible and Artists and albums are present.

I tried multiple fresh install of Volumio and reset factory without success. I tried to replace my USB HDD with an USB Key without success, to avoid undervoltage.

  • Device model and storage type: Raspberry Pi 2 Model B Rev 1.1 / Revision: a01041/ Storage: SD card for OS and USB key for music storage
  • Exact Volumio version: 4.084
  • Log link from your device

Here a log with issue, in log there’s a “No database” log:
http://logs.volumio.org/volumio/ple4Zrj.html

Here a log where I tried to run “sudo systemctl restart mpd” (2 times) without success (no USB key and music visible)
http://logs.volumio.org/volumio/e2wNbcC.html

Here a log when it works:
http://logs.volumio.org/volumio/anvoqTm.html