It happened again. I was doing a demonstration in a class and my shift key got stuck inside of the Virtual Machine Connection windows for Hyper-V. Normally these leads to a reboot of the VM. Fortunately, one of my students found a much better work around. Simply Pause the VM and the Resume it. The Pause and Resume buttons are in the same place on the menu bar.
This quick and effective work around should make this random issue a bit easier to work with.