Windows 7 Pro randomly loses connection to some network drives/shares.

This is a strange one.  I can see where others are having the same issue but I have not found an answer yet so hence this post. 
This issue is happening on a Win 7 Pro system.  As far as I know we are not having this issue on any XP systems. 
Problem:  I have at least one Windows 7 system that every so often will lose access to network shares on our network.  It does not lose access to all mapped drives or shares just to a couple and one server in particular
- other shares are still working fine.
I have logged on as another user to test the profile but it has the same issue.  It doesn't matter if I try to access the mapped drive or browse directly to the share.  It will not connect.
Once I reboot the computer, access is restored like it should be.  It will work for a few hours and then go bonkers again.   HELP!!

Please make the following changes
On the Server whose map drives you don't see
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\lanmanserver\parameters
Value: autodisconnect
Data type : REG_DWORD
Value: ffff (Hex)
On windows 7 client 
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\LanmanWorkstation\Parameters
Value Name: KeepConn
Value Type: REG_DWORD
Value: 65535 (dec value in seconds)

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