This is in regards to those getting the "frame rate" dropped error message, and/or crashing primarily right when the game loads in.
This IS NOT related to connection with the server errors that you experience randomly during a match. We're assessing that issue as well, but I would strongly encourage you to check your ISP provider as well. Yes, that is quite obvious, but I have to say it because that could be the culprit as well, unfortunately.
We're working on a patch that addresses the lobby crash errors and also includes some new MP maps and a host of other bug fixes.