See https://srforums.wpengine.com/pages/support/important_notices.html
Any updates on this? I'm wondering if it could possibly be fixed in Sierra or if it is more of a chipset issue. I have the "one in a thousand" problem on a 2012 Mac Mini (server model, quad core i7).
The disks in a Thunderbolt 4 get ejected when there's any use on them. They can sit idle for days, but as soon as I try to write a bunch of files to them, whammo.
I moved it to another Mac mini (i5 2011) and it works perfectly.
On the original Mini server model, I now have two Lacie 2BIG drives daisy-chained via thunderbolt and they work fine (both RAID 1). It's just the 4-drive Thunderbay that had the issue and it would literally eject the drive within 30 seconds of activity.
Also: any updates if this issue will exist in Thunderbolt 3 (USB C)?
We do not have any news from Apple. However, your scenario is interesting.
Can you send a tech support file to us, just after making this happen?
Send it to support@softraid.com
This is unlikely to be solved by Sierra, it is a hardware issue, we believe.
I certainly hope this issue does not plague Thunderbolt 3 or USB C, but unless Apple puts adequate resources behind this, it very well could.

