I have problem with USB Hub 2.0 7 Port + Smargo Smartreader (V2 ,1.7,triple Reader)

Hello All

I am facing a problem with a 7 Port USB Hub + Smargo reader(any version of smargo).
My smargo failed to read after few minutes or hours. then I need to unplug and plug again to smargo in USB hub.
but when I am using the same smargo in direct PC ports then working fine.

Does anybody have suggestion to solve this problem. I tried 2 other USB HUB.

Thanks

its taking power from USB.
I tried other USB hub that's D link DUB-H7, and its working fine, so I think problem is in cheap USB hubs.

Thanks for reply