RRAS Service Hangs in Win2k3

If this issue has been posted before, I apologize for the redundancy.

I have a Windows 2003 Ent Srv box with 2 NIC's. NIC A is a GB card
pointing to the LAN. NIC B is a MB card pointing to the internet. RRAS
server is running and works well 98% of the time. The issue is the
service hangs periodically and will not route traffic, but retains
connection on the NIC's. The service doesn't crash or stop
completely...it just hangs and quits processing. And there is no VPN
here...just NAT and routing.

For now I have a (admittedly hacky) workaround process that checks for
ping responses from the internet, if there is no response the service
is restarted. And this process works for the current implementation
but will quickly be insufficient when the business process changes. I
have checked NIC bindings, verified DCHP settings, etc. But I seem to
be missing something. Can someone lend me a hand with this one? I
can't seem to find my root cause. Here is a little info to get started
on. I'm afraid the problem is painfully obvious and I just can't
see the forest for the trees!

IP Config info from machine running RRAS:
Windows IP Configuration

Host Name . . . . . . . . . . . . : SSWIN2k3DOC2
Primary Dns Suffix . . . . . . . : SSNET.local
Node Type . . . . . . . . . . . . : Unknown
IP Routing Enabled. . . . . . . . : Yes
WINS Proxy Enabled. . . . . . . . : Yes
DNS Suffix Search List. . . . . . : SSNET.local
SSNET
hsd1.tx.comcast.net.

Ethernet adapter NIC A GB:

Connection-specific DNS Suffix . : SSNET
Description . . . . . . . . . . . : U.S. Robotics 10/100/1000
Physical Address. . . . . . . . . : A0-00-00-00-00-00
DHCP Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : No
IP Address. . . . . . . . . . . . : 192.168.100.200
Subnet Mask . . . . . . . . . . . : 255.255.255.0
Default Gateway . . . . . . . . . :
DHCP Server . . . . . . . . . . . : 192.168.100.100
DNS Servers . . . . . . . . . . . : 192.168.100.100
Primary WINS Server . . . . . . . : 192.168.100.100
Lease Obtained. . . . . . . . . . : Tue, Jan 31, 2006 12:29:55 PM
Lease Expires . . . . . . . . . . : Tue, Jan 31, 2006 8:29:55 PM

Ethernet adapter NIC B MB:

Connection-specific DNS Suffix . : hsd1.tx.comcast.net.
Description . . . . . . . . . . . : Intel(R) PRO/100 VE Network
Physical Address. . . . . . . . . : B0-00-00-00-00-00
DHCP Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : No
IP Address. . . . . . . . . . . . : 24.0.17.xxx
Subnet Mask . . . . . . . . . . . : 255.255.248.0
Default Gateway . . . . . . . . . : 24.0.16.1
DHCP Server . . . . . . . . . . . : 68.87.66.10
DNS Servers . . . . . . . . . . . : 68.87.85.98
68.87.69.146
Lease Obtained. . . . . . . . . . : Mon, Jan 30, 2006 5:59:40 AM
Lease Expires . . . . . . . . . . : Fri, Feb 03, 2006 5:59:40 AM

I would appreciate any help!
Todd