OT external audio cutting out

I’m posting this in a couple of forums so I can hopefully get this solved.

I’m running everything into a mixer then into the Octatrack via Thru Machine.
Tonight the volume started randomly cutting out. The stuff in the OT was playing back fine but all the external stuff was just in and out randomly. Even when I stop the OT.
I have no idea what is happening. I had to power cycle the OT to get it rolling again. This is very concerning as I have a show coming up and I’d rather not stop in the middle of a show to power cycle everything.

Any clue?