While starting/stopping CDKv3 server adapter, you can observe flashing window (coming from hyperV) in terminal tab. The output looks bit ugly, there is pretty much space. When starting/stoping minishift from windows command prompt, you can see such blue flashing/blinking window, too. When I tried cygwin terminal, this did not happen. I am not sure if we can do anything about it, it seems like upstream/system issue.