For about a week now, my HD's will randomly go offline and I won't notice until I open Kodi or Emby and try to watch something. I don't recall doing anything settings-wide. it randomly occurs after a day or 2. My server is always on 24/7.
This is how it looks when my drives don't work:
http://imgur.com/a/Q2vtN
Then after a restart, normal functioning:
http://imgur.com/a/0dEJ1
I was going to paste a log, but not sure which is helpful, the syslog?