I’m editing on a Mac (MacPro late 2013 running OS 10.12.6) with two G-Tech external drives - an 8 TB G-Raid with Thunderbolt, and a 16TB 2-Bay with thunderbolt. 8 TB drive connected directly to the computer, 16TB daisy chained off of it. I’ve been editing for over 2 months now, both drives mount fine and usually work fine. But twice now, when I left the edit bay for a few hours with everything left on, I came back and found that the 16TB drive had turned off ! All connections seem firm and tight. Any idea what’s happening?