I have asked this before, but still have issues with this yet so figured I would run it by again and may finally get this resolved.
We are still having issues where computers here will randomly have issues on the network where it seems like they are unable to connect to the domain. They will sit and try to connect for awhile and eventually just login under the cached credentials.
Of course one of the issues with this is that any network shares no longer work.
Error messages in the event viewer they get are:
NETLOGON 5719 - This computer was not able to setup a secure session with a domain controller in domain......
Time-Service 129 - NtpClient was unable to set a domain peer to use as a time source because of discovery error.....
I have been "fixing" this by rejoining the problematic computer to the domain. This works, but is a hassle and not really a solution to the problem.