This is a strange one. It keeps happening...
I have a total of 8 Domain controllers, this only happens to one specific site and one specific child domain.
Server 2012r2 and Server 2016. forest level of 2008r2
the DC will be working fine, handling all requests etc. However when you reboot, you can no longer log in to console.
This is happening on physical and virtual machines.
If I disable the vm's nic in VMware, start the machine up with out being connected to the network, I can log in. Then I turn the nic back on.
The other symptoms are when the machine reboots it uses all ram assigned to the VM if it is going to fail.
It will get to 'waiting for ADDS', then reboot again.
When it does come up, I can enter my password (or any password) and it won't allow me in.
I disconnect the nic, reboot, it allows me to log in and turn the nic back on.
Some of the things I'm seeing in event viewer
The winlogon notification subscriber <GPClient> is taking long time to handle the notification event (CreateSession).