My net speed:
And I still disconnect from the game.
There are other various reasons that people disconnect and/or lag.
Skype, Akami, and Pando Media Booster are all known
bandwith sappers. People could possibly be running other services, and in fact, a lot of services that your computer runs, aren't really necessary.
The game isn't perfectly coded and has huge memory leaks.
You're really close to the Aeria central server (located in Canada). Yes, location matters. The farther you are from your router, even, the slower your connection.
After patches, the game makes changes to your files, usually flagging firewalls and antiviruses and blocking the game and/or the specific files that have been changed.
Sometimes, random D/C's happen for really no reason.
Other people's net connection may not be fully stable and might just "derp" if you will.
Your "test" only works for you. You haven't interceded any variables to your testing, therefor making it a very small, and quite honestly, unimpactless "break through".