VMware URB Timeout Alert

Running a stand alone host with ESXi 5.1U1 on local storage.

I keep getting the following warning message every few days:

EventInfo :Issue detected on in Company Data Center: URB timed out - USB device may not respond (2013-10-04T19:33:26.272Z cpu5:8656)

EventType : warning

This is not a VMware issue. Contact your hardware vendor to determine why the USB errors are occurring.

To workaround this issue power off the system with ESXi on a USB drive and restart after 20 seconds. The warning message does not appear during reboots after the system is shut down completely.

There are no USB devices plugged into the ESXi host and I am not running ESXi from a USB device.

Does my ESXi host just need a reboot?
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Andrew Hancock (VMware vExpert / EE MVE^2)Connect With a Mentor VMware and Virtualization ConsultantCommented:
I would escalate this error message to your Server Vendor and/or VMware Support.

Have you update all your firmware on your server, to the latest?

the following article suggests, Power Down the Server, wait 20 seconds, and the errors should stop.

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