Connection Troubleshooting Resources
Most connection issues have similar causes, but the steps which are most helpful for your specific problem will vary based on what you’re experiencing and when the problem happens. If you receive an error code when you are disconnected, you can search for the error code here. This may provide more relevant troubleshooting for your individual problem. If you don’t find a resource for your error at the above link, the links below can help resolve most other issues.
1. Disconnections while playing Starcraft II
2. Unable to connect to Starcraft II
3. Latency while playing Starcraft II