Question / Help Noise one hour into session

#1
Hi there. About one hour or so into every session a terrible noise appears in the audio and makes the recording unusable. Exiting and relaunching OBS Studio makes the audio good again, until the noise reappears. I am getting my audio through a BMD DeckLink Mini Recorder 4K. I have used other capture cards as audio sources with OBS Studio in long sessions before, with no problems, but because right now I am covering an event where the sound mixer is far away, I need a source with an SDI input.
The noise is absent when there is no sound, it grows with the signal.
Any ideas? Thank you in advance.

https://obsproject.com/logs/ITqQwnXpWqcfEwvs
 
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