For a long while now I've experienced USB devices intermittently disconnecting on my Macbook Pro Retina 2012 (El Capitan 10.11.2).
I'm currently using a Targus 7 port USB 3 hub (http://targus.com/au/usb-30-7-port-hub-with-fast-charging) but this problem existed when I was using an older USB hub. I bought this one in the hope it might resolve this problem, but it didn't.
This USB hub is connected to its power adaptor.
From memory this problem also existed before El Capitan update.
For work I use Microsoft Lync for Mac, and I sometimes notice than when a new instant message arrives, my keyboard, mouse and headset will disconnect. But they also sometimes disconnect without this trigger.
To reconnect them, bizarrely, i seem to need to unplug and replug each device in 3 times specifically.
It's very frustrating and inefficient for my workflow. Just wondering if there are any suggestions or recommendations as to how I can troubleshoot or resolve this?
Following are screenshots of the USB map (two separate screenshots as the contents of the USB 3.0 Bus details page didn't fit in one screen)