These steps were done on a Cyan test image (R55-8801.0).

1)  Download and flash a recent Cyan image.

2)  Makes sure you have the standard USB3.0 Ethernet adapter (this is available at techstop):

https://mystuff.corp.google.com/stuff/items/703
http://www.monoprice.com/Product?p_id=11195

3)  Use this Ethernet adapter to ssh into your cyan machine.

4)  print lsusb

localhost ~ # lsusb
Bus 002 Device 003: ID 0bda:8153 Realtek Semiconductor Corp. 
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 002: ID 8087:0a2a Intel Corp. 
Bus 001 Device 008: ID 04f2:b490 Chicony Electronics Co., Ltd 
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

5) Reboot your machine.  You shouldn't be able to connect to your machine after a reboot unless you take the adapter out and plug it back in again.

I've also seen this issue with USB3.0 memory sticks.  I don't see this issue with veyron_minnie.