Ya, the problem here is being booted to login. If my toon is just standing somewhere doing nothing, I can stay connected for quite a while. But as soon as I go do anything where data needs to be retrieved, I'll get booted after a few minutes. I tried running around killing mobs as fast as I could to keep data moving, and what I found was that doing this would result in being booted at almost exactly every 5 minutes.
When I ran the MTR test, I didn't notice a complete disconnect on any of the nodes, but I did have someone talking to me for a minute or so while I was running the test, so I could have missed it. The only thing I really noticed was that one node losing 7%. Maybe I'll try running it again.