My ART Opto 8, which I use as an extra 8pre to ADAT into a MOTU 828x (all software and firmware up-to-date) has started doing the weirdest channel hiss.

Each of the 8 channels hiss, one at a time, in sequence. (see here). The hiss is very distinctive and makes it unrecordable. (Listen here).

The output channels are totally unaffected. Given the nature of the hiss across the channels, I'm assuming this is some sort of wiring or power issue? Does anyone know about electrical engineering enough to know? Or have you had this issue before?

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    I'm voting to close this question as off-topic because this is a technical support question for ART – Mark Jan 15 at 0:12