I'm also a RCN user in the DC area. My husband and I are definitely having lag problems. Nothing constant, but staggered enough in 5 - 10 minute intervals, which almost always end up with one of us getting booted by the 90000 error after a half an hour or hour. Considering how we've never had lag problems (and didn't until this SE update,) it obviously is just this game. I just finished talking to a service representative and they too said they're aware of the issue. They just wanted my address so they could add it to their resources as they attempt to fix the problem.

<3 RCN. So glad we went with them and not Comcast.