The adapter is connected to a usb hub, where my IR dongle also is

I Bought this device to stream movies from my NAS throug XBMC, but;
On wifi i can browse my NAS and see some movies but all of those doesnt steam smoothly

I try to plug in the Ethernet adapter and a Lan cable, but my connection is even worse on the cable?
What is going on? Do i need some driver for the lan adapter or something?
I use the standard ROM:ONBOARD NAND Flash 8g
i dont need to use the device to any other thing than Netflix and streamin movies from my NAS.
Alternative i could plug the NAS (WD Mycloud) Straight in the device throug a USB cable, but i would prefer if it could works through Lan cable.
Any suggestion?
Thank in Advance
Thomas.
And sorry for my poor english, i'm from Denmark, where english isn't our first language

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