2003 Terminal Server frequently disconnects RDP sessions

Hello experts!  
I have about 30 servers that I support.  
I pride myself on my expertise in terminal services.  I've been setting up and supporting terminal services for almost 15 years.  
I have one server that has me beaten down and bloody!!
Stand alone 2003 server with (2) XEON cpu,s 4GB RAM and RAID-1.  
We have about 25 users.  5 or so are in the same building as the server and the rest are remote on VON connections.  

The remote locations appear to freeze and then reconnect at random times during the day.  
The primary location with the terminal server has a T1 line and a DSL line with a Linksys/Cisco RV042 as the router.  
I put in a brand new router with no better results.  I have not messes with the MTU or anything in the router.  
I have tried direct thru the internet with no VPN.  tried VPN over the DSL line instead of the T1.  
Network adapter is the latest and greatest on drivers.
Keepalives are enabled.  
I build these servers virtually the same.  
What could be happening here?  My reputation is at stake.  Worse, I want this client to be productive in this economy.  They are very good folks!
Any ideas???
Network settings?
Registry settings?
Switch to carrier pigeon???

Thanks in advance for your advice/opinions/answers!

brian
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TSguruAsked:
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Hypercat (Deb)Commented:
This could make a difference.  Have you been able to determine if it is the Internet/VPN connection or the terminal server connection that is disconnecting? Have you eliminated the Internet connection and hardware (router/modem) at the remote location from the equation? That's where I would look first at this point. I recently had a misbehaving router in one office that was automatically disconnecting itself from the Internet every 10 minutes, so it could even be something like that.
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