Thanks Rseiler
You might be onto something - I left Windows Explorer up and watched my D: disappear then re-appear, so it does seem to be disconnecting. Right now none of the Smartware apps aren’t able to do anything because the drive keeps disconnecting.
Sent a message to support, but I suspect I will be returning this drive. Something is hideously wrong, and hours spent trying to trouble-shoot is not time well spent.
Thanks for your help