Thank you for your post.
We have noticed that from time to time, Hyper-V on Windows 10 can loose it's connection to a virtual machine. This also happens with virtual machines that were not created with viBoot. Normally it just requires opening Hyper-V Manager and reconnecting by either double-clicking on the virtual machine, or selecting it with the right mouse button and choosing "Connect" from the drop-down menu.
If this does not solve your issue, please let us know and we will do are best to help.
Jamie - Macrium Support