HifiBerry DAC+ ADC Pro on RPi 4, sound drops completely after a few hours


Just recently installed my HifiBerry DAC+ ADC Pro on a RPi 4 with the latest LibreELEC/KODI.  I added "dtoverlay=hifiberry-dacplusadcpro" to the appropriate place in config.txt and it seems to work just fine for a number of hours, then the audio will cut out.  Get it back, I shut it down, unplug and restart everything... and then after a few hours it happens again.

dmesg shows this several times in a row:

[ 3891.059025] pcm512x 1-004d: No SCLK, using BCLK: -2

But that doesn't seem to cause the audio drop, but then this one does appear to coincide with the dropped audio:

[20017.198742] pcm512x 1-004d: Failed to set digital mute: -121



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