Tidal only plays right channel, help!

I use Tidal in two systems in my house. My work set up streams from a PC through a Dragonfly and I have no problems with it. My main rig streams from a Mac Mini through a Mytek Brooklyn. When it works the sound is very good but usually five minutes after I start it up the left channel disappears. No amount of fiddling with the computer's settings seems to affect it. The left usually returns in ten minutes or so. It's not the stereo, left channel is fine with all other inputs. Anyone have thoughts?
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Do the level meters on the Brooklyn's display show the channel loss, or do both still show activity/signal?
Sorry so slow to reply...They display both channels working. I tried something yesterday that seems to work; I switched pre-amp (Lamm LL2 Deluxe) inputs and Voila! I hope this does it because I've had false positives before.
Still no resolution. A few times I have been fiddling with the system and suddenly it starts to work but apparently that’s coincidental and not repeatable.