From owner-freebsd-usb@FreeBSD.ORG  Thu Jul 31 16:10:49 2014
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Date: Thu, 31 Jul 2014 18:11:14 +0200
From: Hans Petter Selasky <hps@selasky.org>
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To: sbruno@freebsd.org, freebsd-usb <freebsd-usb@freebsd.org>
Subject: Re: Random issues with xhci
References: <1406822044.1364.1.camel@bruno>
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Best way to debug is to log all USB traffic:

usbdump -i usbusX -s 65536 -w usblog.pcap

Then try to see if there are any USB errors happening before the XHCI 
controller resets.

Thank you!

--HPS