Remote Desktop freezing

I have a terminal service server that has no more than 9 people on it at a time.  The connect using a WYSE V10L.  The issue is that they log in just fine, but the session keeps freezing every 45 minutes to and hour.   I have 3 different offices going to the same server and they all experience the freezing issue so I know it is not their internet connection.  I have changed the RDP Compression settings to Balances memory and network bandwidth.  Any help in this matter would be great.  System info is below. Thank you

1. Logon to the Remote Desktop Services Session Host computer as an administrator
2. Start--Run gpedit.msc
3. In the left pane, under Computer Configuration, navigate to following:
Administrative Templates\Windows Components\Remote Desktop Services\Remote Desktop Session Host\Remote Session Environment
4. In the right pane, double-click on Set compression algorithm for RDP data
5. Select Enabled, and choose Balances memory and network bandwidth
6. Click OK to save the change

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OS Name                        Microsoft Windows Server 2008 R2 Standard
Version                              6.1.7601 Service Pack 1 Build 7601
System Model                        PowerEdge R410
System Type                        x64-based PC
Processor            Intel(R) Xeon(R) CPU E5630 @ 2.53GHz, 2527 Mhz, 4 Core(s), 8 Logical
Processor            Intel(R) Xeon(R) CPU E5630  @ 2.53GHz, 2527 Mhz, 4 Core(s), 8 Logical
BIOS Version/Date                  Dell Inc. 1.12.0, 7/30/2013
SMBIOS                         Version      2.6
Boot Device                        \Device\HarddiskVolume1
Installed Physical Memory (RAM)      16.0 GB
Total Physical Memory                  16.0 GB
Available Physical Memory            12.3 GB
Total Virtual Memory                  32.0 GB
Available Virtual Memory            28.2 GB
Page File Space                        16.0 GB
Page File                        C:\pagefile.sys
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Brian PlunkettAsked:
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Michael PfisterCommented:
How do the user fix their problem? Reboot the thin client? Are they able to reconnect to their session?
Things I'd try:
put one of the thin clients in the LAN  segment of the terminal server and check if it freezes as well.
Use a standard Windows system on a remote location and see if this works.
Check that the thin client os is up to date

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Davis McCarnOwnerCommented:
Have you checked their session timeout settings?
Brian PlunkettAuthor Commented:
To fix the problem  the user has to hard shutdown the thin client. i will try an hook one up an see if it freezes. we can not install the Windows 7 os on the server because it will not allow more that 1 user to remote in at a ti.e. let me test the thin client
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Brian PlunkettAuthor Commented:
@Davis i have not checked the session ti e out settings. where do i find those?
Michael PfisterCommented:
No, I meant replacing one of the thin clients with a Windows 7 system and test if the RDP session freezes as well.
Davis McCarnOwnerCommented:
Dirk KotteSECommented:
as explained by mpfister ...
try a Windows System as Client.
possible the thin-client Management kill the System.
CoralonCommented:
Have you put on the recommended fixes for it?  This is a Citrix article, but it references several Microsoft hotfixes that are important for a 2008R2 RDS box.  

I have eliminated freezing on several boxes by installing these.
http://support.citrix.com/article/CTX129229

Coralon
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Windows Server 2008

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