Wierd deal. I had been having an issue where the "second" USB port on my 15" 2011 mbp would sporadically go dormant, and would NOT reactivate until I rebooted or restarted the machine. Took it into Apple genius bar today, and they determined i/o board not getting proper voltage/current at ports. Part ordered. Anyone else had an issue with the USB or other ports going inop sporadically?