Flaky usb connection on Cerbuino?

We have a Cerbuino board we’ve been using about a week. It’s been reliable until today. At first we were getting lots of errors on deployment:

 "Device not found or cannot be opened - USB:Gadgeteer"

Now when we plug in the device, Windows (7) doesn’t even recognize it as a USB device most of the time
(only intermittently show up in device manager - it used to show up consistently as "debuggable .net device).

I’ve tried re-booting my PC, and plugging in to different USB ports to avail.
I’ve tried with and without the external PS attached to the Cerbuino.

Anyone else seen this or have suggestions

Can you open mfdeploy and erase the app?

When i get “Device not found or cannot be opened - USB:Gadgeteer” - i switch to Serial and then back to USB and usually VS sees it again

The board started working again. The only difference was the USB cable!