Question / Help random audio distortion

Hi, I am streaming to youtube via OBS using a blackmagic ATEM 1/me. Audio is a line level feed from a midas M32 audio mixer. I have been having issues with random audio distortion that I cannot seem to duplicate with any consistency. An example is in this video at 3:11

https://youtu.be/eq86fluP6uU

I am adding some gain within OBS and I suspect that this may have something to do with the issue but I can't imagine why distortion would happen at such odd times and have no apparent correlation with input volume.
 
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