OT: USB3 drive occasionally not detected

[Timothy Kesten <centos-lst@xxxxxx>]

Hi Folks,

CentOS 5.5 x86_64

Asrock-Board with 2 USB3 plugs.

Normally USB3-drive is detected. But occasionaly after "umount" next time this 
drive or other ones will not be detected.
I have to boot the PC - than it works - till next unrecognition.

On USB2 plugs all works  correct.

No messages in /var/log/messages nor dmesg.

What happens here?
Board failure - or other reasons?

Some hints welcome.

Timothy
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