Hard drives in dual dock keep ejecting

I had 2 spare 3.5" 2TB internal drives, new, so I bought a dual dock/enclosure to put them in to connect it to my Mac Mini for an easy 4TB of storage.
I bought this one, as it claimed to be Mac compatible:
http://www.amazon.co.uk/dp/B00D1NR9MA/
All seemed well, both drives show on my OS X desktop as 2 separate drives.  However after a few weeks, I noticed they had both disappeared from the desktop in OS X (i.e. ejected).  There was no usual OS X warning about not ejecting the disc properly, so I assume they were ejected by the OS.
The unit was still powered up ok, so after unplugging/plugging back in, they showed up again, but the same thing happened after a week or so.
I tried a different USB3 cable, same problem.
I contacted Inateck, who said it must be faulty and kindly sent me a new unit.  Exact same problem.
Any idea what's going on?
Thanks

See if you can return it and look for an enclosure at:
Other World Computing

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