If you could tell us a bit more about your deployment, especially which (VCS-C or -E) how the VCS and endpoints are deployed and which software versions you run.
The latest software versions would be TC7.3 for the MX200 and X8.5 on the VCS.
If its a virtual VCS please make sure that the system requirements are matched!
http://www.cisco.com/c/dam/en/us/td/docs/telepresence/infrastructure/vcs/install_guide/Cisco-VCS-Virtual-Machine-Install-Guide-X8-5.pdf
Which user do you use to access the VCS via SSH, root or admin.
The xcommands are only valid if logged in as admin. Though as the system
is marked as "busy" the admin tsh might not work proper.
I would try to login as root and do a: shutdown -r now
If that does not work do a power-cycle or if its a virtual machine use the visualization environment.
In general this should not happen. So if you do not bring it up, its urgent and you have a valid service contract you can also consider to open a TAC case.
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