Hi. My Quattro is tripping fairly often. When I turn it on it often develops a loud humming/chattering sound (I have included a link below to a recording the sound as I start up, then it trips after a short while). It's not related to load, as it happens when the device is isolated from the loads as well. Any ideas what it might be?.
I think it is from the top right of the box, behind the circuit board. The sound does not always occur. I can't find a pattern
https://drive.google.com/file/d/1L4-mZaWEftWAwWQJaimiz0CatV1xImYf/view?usp=drivesdk
