Microsoft has posted an alert for some VMs running in the South Central United States region. Microsoft states "Starting at 19:40 UTC 25 June 2018 customers in South Central US may be experiencing trouble connecting to resources hosted in this region. Customers may also have experienced Virtual Machines rebooting unexpectedly. Engineers are currently investigating." We will continue to monitor the situation. For additional details please see the status on Microsoft's site.
Microsoft has given the all clear for VMs.