Hello everybody,

First my configuration.
iMac (Retina 5K, 27-inch, Late 2015)
RME UC with latest usb (Sierra) and firmware drivers from the RME download section
OS: MAC OS Sierra 10.12.6

Does anybody have a similar experience?
While I am on the desktop mac is running, and close down the UC interface from the back with the power switch. (usb cable connected directly from mac to audio interface, no hubs are being used).
I lose bluetooth connection on mouse and keyboard the bluetooth icon changes to a different one as if its disabled?
Also my external hard disk is ejected the moment I close the UC interface.

Usb cable and power adapter are the same from the original package since I bought the UC new recently.

The only solution is to forcefully restart the mac.
Is this a known issue? any suggestions or similar experiences?