Digi2 Pro

I've got a Digi2 Pro on a RPi4 with 4gb ram running RPi 64-bit OS.  It has seemingly very random startup failures.  Maybe every 3rd or 4th boot up, the Digi2 Pro will have zero output on the toslink port (no red light and no audio).  I will power cycle a couple times and it will come back on.  It's finally getting frustrating enough to see if there is any way to make it more reliable.  Any guidance would be appreciated.  Thanks!!


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