MAC Client on a Windows Domain loses connection to Terminal Server consistently

We have one user who uses a MAC on a Windows network (2003 & 2008 server) domain with about 110 Windows desktops and laptops.  He connects to drives through file sharing and we use gmail for email so we're good there.  However, to use some applications, he connects to our terminal server.  When he's outside the network connecting to an external IP, he never gets connected, but when he's connecting to the terminal server from inside the network, he gets disconnected almost every 10 minutes.  He's reporting that it shows a message saying something like 'you've been disconnected from your session' (paraphrase there), and offers a button to reconnect.  He also says that he'll get disconnected from the internet occasionally as well (but that is not as frequent, probably because he's not noticing it when he's just reading pages).  Is there something we need to be doing to ensure that his connection through/to the Windows domain stays constant?  I am very unfamiliar with MACs and have struggled just to get his network shares and basic connections working, so this need for such a consistent connection is puzzling.  Thanks so much!
mdcr1Asked:
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k3v1nmcCommented:
If it's just related to terminal services: I work in an environment with tons of Macs and needs to connect to various RDP and Terminal Services MS servers... We bailed on the MS supported app: http://www.microsoft.com/mac/remote-desktop-client ... and started using: http://cord.sourceforge.net/ .. Much better performance and less disconnects or spinning beach balls....  MS Client is very unstable on Lion+ Mac OS 10.7+...
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