server 2012 can't login

We have a few 2012 servers now for a few clients and on several of them at times we can't login it just says the password is wrong. And we are sure of the passwords. Nothing works short of rebooting them then we can login. Has anyone else seen this? Or know how yo prevent it?
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Axis52401Security AnalystAsked:
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David Paris VicenteSystems and Comunications  Administrator Commented:
That could be related with Network  adapters or network hardware or could be related with a poor network performance in 2012.

You can try tweak windows 2012 for a best network performance with thistutorial.

Let us know if helped.
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Axis52401Security AnalystAuthor Commented:
Its separate servers on different hardware for different clients. Seems unlikely to be a network adapter problem especially if.its the domain controller
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David Paris VicenteSystems and Comunications  Administrator Commented:
OK.

So check the link that I posted and see if help.
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Axis52401Security AnalystAuthor Commented:
I did but thats about a network file transfer speed issues. Our problem is when this problem happens we cannot login to the server
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David Paris VicenteSystems and Comunications  Administrator Commented:
Yes I know I thought this would be related with network issues.

So lets move forward, are your DNS servers correctly set up?
Do you have any security or application events?
Can you access to the server through FQDN?
Are your DC reporting any issues related with replication, netlogon, SYSVOL, PDC?

Let us know.
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Axis52401Security AnalystAuthor Commented:
After the reboot the problem goes away. Nothing in the event veiwer except previous shutdown unexpected.
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Windows Server 2012

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