If you're seeing SOS errors or battle disconnects and you've already tried running through the basic troubleshooting steps, there are a few more things you can try; the following three steps will address the most common contributing factors.
- Disable PepperFlash and ensure you're only running one version of Flash.
- Plug your computer directly into your router or modem using an ethernet cable.
- Test your network connection by running a Traceroute.
Some steps above link to an article that should walk you through the process.