My new AW15 has now had the 4th and last USB port fail.  The SS port by the power port will still supply power, however no data is passed, no devices are detected.  The other three ports have no power so no devices are detected.  The one on the right closest to the SD card slot had worked yesterday until I put the laptop in hibernate mode.  Upon restart that port failed too.  Looks like I will be contacting tech support tomorrow.  Wish me luck.