DFS Domain Based in Windows 2000 Server mode hosted on 2012R2 Domain Controller

I have a large environment with around 45 domain controllers.
All OS Versions are present in as Domain Controller: 2003, 2008R2, 2012 and 2012R2
The Forest and the Domain Function Level are 2003

I have the issue that some Windows 7 client PCs sometimes do not see the DFS Folder structure suddenly. After a reboot or waiting 5-10 minutes the structure is reappearing again (nothing is been done in the meanwhile)

I have also a mixture for the DFS Namespace Servers (2003 , 2008 and 2012R2)

I figured out that the DFS is running in : "Domain Based in Windows 2000 Server mode"
I am wondering if this is a supported scenario or if there is another root cause for the client issue(S)

Can anyone please help me.

Thanks in advance
serveropsAsked:
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MaheshArchitectCommented:
On DFS server run below command
net config server /autodisconnect:-1
Above command will turns off the autodisconnect feature of the server service on the server side so that all workstations that have the network map drive to the server can keep the connection live as long as they want to. To do so, simply run the following command from a DOS Prompt window that runs as administrator.

Also you may try registry twik to increase KeepConn value on Win7 Machines
Fixing this issue on the client side involves the registry change. Simply open regedit and locate KeepConn key in the registry:
HKLM\SYSTEM\CurrentControlSet\Service\lanmanworkstation\parameters
If not exist, create it in Reg_Dword, and set the time in seconds. For example, I set it as one day to keep the connection live as per below article
http://www.nextofwindows.com/how-to-fix-the-red-x-on-the-icon-of-mapped-network-drives-in-windows-7/
Original base article: http://support.microsoft.com/kb/297684

If you still facing issues with mapped DFS share through the mapped network drive in Windows Explorer then check below hotfix
http://support.microsoft.com/kb/983620

If you have offline files configured with DFS, you can check below hotfix
http://support.microsoft.com/kb/2705233

Mahesh.
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