Terminal Server Event Viewer Error 56

I have a terminal server set up with licenses for 20 users. Around the same time each day those users start getting kicked off their TC connections. This is one of the error logs:

The Terminal Server security layer detected an error in the protocol stream and has disconnected the client.

Have not been able to figure this out. It's running Server 2008 R2 Standard and is a very new Dell PowerEdge T610 box.
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Darius GhassemCommented:
See if this helps

http://blog.lmello.com.br/?p=22

If Shadowing please read this http://support.microsoft.com/kb/2533983/en-us?sd=rss&spid=14134

Another one to read http://www.terminalserviceslog.com/blog/index.php/2010/02/24/client-disconnect-due-to-error-in-the-protocol-streamsource-termdd-event-id-56/

The problem is listed in the information in the Event log

Update network drivers as well
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Windows Server 2008

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