You can also try plugging those dacs and go to device manager and completely uninstall it through device manager that way your PC will forget all drivers give you PC a good restart and plug then in again.
Darn. Was hoping this would be a simple fix with windows audio exclusive mode killing certain programs, but that's not the case if the internet is dropping out entirely.
That it was working before means it's probably not a power issue. I wonder if the computer is misrecognizing the USB device as a network connection, trying to connect to that, and failing? Don't know how to deal with that other than reinstalling drivers and hoping for the best.
One last shot in the dark: all of your DACs use XMOS; perhaps something went terribly wrong with your XMOS drivers during the update. Try reinstalling those or try a DAC using a different USB chip to see if that's the problem?