Comcast netgear cg3000dcr modem keeps dropping external RDP connection

I have Comcast business class internet service.
I had an SMC modem with an open port to pass RDP through so I could remote in to an internal workstation.
It was working great for months; totally rock solid.
Then the SMC modem failed and Comcast came out and replaced with a new "better" netgear cg3000dcr modem.
I reconfigured the firewall to allow a port through for RDP.
Now the RDP works for about 2 minutes, hangs for about 30 seconds (times out), then reconnects, then works for a couple minutes, hangs, reconnects, etc.

The comcast tech says the modem firmware is most current.
He also said he turned off vp6 firewall just in case that was interfering.

Any ideas what else I could try.

Also, outbound connections are fine.
Also, I use LogMeIn to get to one of the internal machines and it never drops.

Could this be some sort of protection built in to the modem?  Does it think that someone is trying to hack in to the network from the outside?

Is there any utility I can use to show traffic coming in through the firewall and show that it is suddenly dropping packets?

Should I configure the netgear vpn and just go the vpn route?

Thanks,

Kevin.
kevinvw1Asked:
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Davis McCarnConnect With a Mentor OwnerCommented:
Get a copy of Pingplotter Free (at the bottom of the page) http://www.pingplotter.com/download.html

Install it on the remote PC and point it at your comcast ip.  Pay attention to the PL% column which is lost packets.  If any hop is worse than about 25%, it is the culprit.

When I had this same problem a few years ago, it was a relay ip in Atlanta and a real b*tch to get T/W to fix!
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