Disconnecting From Server

3 things that can be wrong.
1. Your laptop/computer is too slow to run crossfire... For that to happen you could only have less than 1gig of ram and 1.0 proccessor..
2. You're too far from the router if you're using one. If you're using a wirless router to connect, you might be too far or too many people are connecting to the router at once...
3. It could just be crossfire's fault. There's been problems with people and their ping.. So maybe if your average ping is 100, then you're just disconnecting because the servers are amping your ping to 300..

In any case the only way to fix it is if your PC is too old or packed with tons of programs. There's no real way to get better internet speeds unless you live closer, change the people who give you the internet connection or just go into a server that's closest to you (U.S. West Server or U.S. South Server).