I know that there are a lot of people that have some connection issues (unable to connect or getting disconnect randomly). Here are some things you should look at to try and minimize your connection issues!
1. Rebooting your computer sometimes help clear things out
2. Make sure that your network, or wireless, card drivers are up to date
3. Reboot your router and/or your cable/dsl box. Doing a "hard reboot" is a good thing to try. That means unplugging to 30sec and then plug