Consistent RDP disconnects

We've had an issue for a while now where RDP connections are dropping every few minutes.

It's happening both ways, RDP connections into our office or out from our office.

This also appears to happen regardless of whether or not we connect over a VPN. It also affects Citrix GoToMeeting.

I'm wondering if it's a firewall setting? It happens very consistently every 10 or 15 minutes or so, all throughout the day. And again, it's both ways, and not limited to any one machine in the office. RDP between systems on the internal network are fine.

I thought it could be an internet connectivity issue, so I ran an internet connectivity monitor from this site: https://code.google.com/p/internetconnectivitymonitor/ and had it attempt to connect to google every 5 seconds for 30 minutes, it didn't report any disconnects, and I generally don't have issues with disconnecting from websites. So I don't think it's an internet connectivity issue.

I also ran a couple of trace routes:

From my house to my office:

Tracing route to 75-150-44-1-Oregon.hfc.comcastbusiness.net [75.150.44.1]

over a maximum of 30 hops:

1 7 ms 3 ms 3 ms 10.0.0.1

2 * * * Request timed out.

3 10 ms 12 ms 12 ms xe-0-3-2-32767-sur04.beaverton.or.bverton.comcast.net [68.85.148.249]

4 11 ms 11 ms 12 ms te-3-0-0-ten11.beaverton.or.bverton.comcast.net [68.85.149.58]

5 19 ms 16 ms 20 ms c-98-246-138-191.hsd1.or.comcast.net [98.246.138.191]

6 21 ms 16 ms 15 ms 75-150-44-1-Oregon.hfc.comcastbusiness.net [75.150.44.1]

From my office to my house:

Tracing route to c-67-189-18-29.hsd1.or.comcast.net [67.189.18.29]

over a maximum of 30 hops:

1 <1 ms <1 ms <1 ms 10.0.0.1

2 <1 ms <1 ms <1 ms 10.1.10.1

3 5 ms 5 ms 3 ms 73.90.88.1

4 7 ms 7 ms 40 ms xe-1-1-2-32767-sur04.beaverton.or.bverton.comcast.net [68.85.149.57]

5 7 ms 8 ms 9 ms te-3-0-0-ten07.beaverton.or.bverton.comcast.net [68.85.148.250]

6 17 ms 15 ms 16 ms c-67-189-18-29.hsd1.or.comcast.net [67.189.18.29]