I have been using a Raspberry Pi 3 with Hifiberry Digi+ standard running Libreelec.
Except from a restart (freeze) about once a month, it has been working fine for over a year.
But yesterday I did a restart becasue of a freeze, and after that I have not been able to get the sound output to work.
I tried different settings on the reciever first, to no luck.
Then I checked audio output settings in Kodi, to no luck.
I then checked the Hifiberry optical out, and I cant see any red light emitting when I pull out the optical audio cable.
Not sure how to troubleshoot it any further?
This is the output seen when I type "aplay -l" in SSH:
**** List of PLAYBACK Hardware Devices ****
card 0: sndrpihifiberry [snd_rpi_hifiberry_digi], device 0: HifiBerry Digi HiFi wm8804-spdif-0 
Subdevice #0: subdevice #0
Raspberry Pi 3 - After reboot no sound