Docking station with 2 (?) USB3 ports

Bought by 3.5 "hard drives quickly wechselnzu can - and (was important to me!) The front of the computer two USB 3 ports for external mobile 2.5" drives. Installation without problems, on the Asus board, there is a power strip for the USB3 cable.
As with another Sharkoon device (2.5 "- USB3 connector strip) only one does a USB3 connection :-( Even after a necessary motherboard exchange the same problem causes: poor quality or errors of the (!)!. ELECTRONICS ???