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GA-Z77-UD5H front panel USB3.0 drops

GA-Z77-UD5H front panel USB3.0 drops
« on: December 09, 2012, 07:01:49 pm »
My two front panel USB3.0 port is connected to F_USB30_1 header, but only one of the port works.
The other one semi works,but drops/disconnects after 3-4 seconds when transferring files.

I have intel usb 3.0 drivers installed 1.0.6.245 & intel extensible host controller 1.0.6.245
What could be the problem? Noticed in Win7 Device Manager there are two "Generic USB Hub" with yellow exclamation icons.