LVDA get unregistered randomly after reboot

The customer said their LVDA get unregistered randomly after reboot...

"The network logon service was not started" when logging onto PVS Target Device via Console

When logon PVS Target Device TD via console, it throws below error: "An attempt was made to logon but the network logon service was not started." TD VDI is unregistered status in Citrix Studio...