Question / Help OBS Stream fine15 mins then static - same recording audio video in OBS

I did a test stream on Mixcloud for 30 minutes, everything looked and sounded fine. All of a sudden I start to hear static in the audio ( I was looking at the stream on another computer) My audio coming from my mixer sounds fine no static at all so I would think you should see something in the logs. Also I then shut the stream and recorded myself in OBS for 5 minutes, played it back and I hear the static there too. Just to make sure I did another stream on Twitch as I thought it might have been Mixcloud but static again. Any help here frustrating!
 
First what I'm using:
MacBook Pro 2015 16MB mem

DJM900NSX2 mixer

2 Logitec Cameras
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my laptop has 2 usb busses so the last thing I did was to pull the cameras from the USB port ( powered) so only thing running is the USB for the mixer and after an hour or so the noise did not return. That was yesterday as this has to be an OBS problem as I got the static when I recorded and streamed at different times.

I'm left with my facetime camera which is a little boring for viewers any adjustments I can make to accomidate at least one Logitec camera. I'm sure the errors show in the log. Any help please?
 
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