Mac mini usb 3.0 and external drive with Sleep issue

I have now a new mini with USB3.0.
I attached an external sharkoon sata quickport h3.
If i use an USB 2 cable everything is fine.
When i use USB 3 cable then after sleep, OSX says that the external drive was not properly dismounted....

So, i tried an external USB3 2,5" harddrive and it works directly on the mini.
When i plug this drive to the sharkoon, it doesn't work.
So it seems that the USB3 Hub of sharkoon isn't working properly with the power managament of osx.

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