Can't log in with ethernet cable plugged in

I have a whole department that has the same basic image and exact same workstations as other departments but solely has issues logging into their computers after a restart or shutdown. To log back in, they need to unplug their ethernet cables. Otherwise,
it never gets passed the welcome screen. After looking through the event logs, I see that when they are trying to log in with the cable plugged in they get an error stating:
Error      4/23/2014 10:31:52 AM  Microsoft-Windows-GroupPolicy             1055       None     "The processing
of Group Policy failed. Windows could not resolve the computer name. This could be caused by one of more of the following:
a) Name Resolution failure on the current domain controller.
b) Active Directory Replication Latency (an account created on another domain controller has not replicated to the current domain controller)."
It seems that they are getting in with cached credentials and I've looked up the error and tried to see if there are DNS issues with the workstations being able to contact the DC and I can't quite figure out why this is happening. Does anyone have any suggestions
as to why this is happening? Any help would be appreciated. Thank you

I have been thinking about rejoining the machine to the domain but it is difficult to log in to the machine as an admin or any other acct that isn't the common user of the machine so I haven't tried it. All of the machines in that department aren't connected
on the same switch. The dept does not have a separate DC and it is not an RODC, it's a global catalog DC. I haven't run rsop.msc but have run a GPresult and I don't see any errors. 
Thanks

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