After having used our office hifi berry for two years or so, over Christmas it now stopped working:
[ 8.524132] snd-hifiberry-dac sound: ASoC: CPU DAI (null) not registered
[ 8.812327] snd-hifiberry-dac sound: snd_soc_register_card() failed: -517
Rebooting the pi doesn't help, it works fine, only sound is broken now.
Is it possible it really just died on its own? There was no physical interaction with the device whatsoever.