Thanks for using the Answers Forum! If you just changed your router, you may have to configure the settings for the Slingbox again. Here are a few articles that will help make sure your network connection for the Slingbox is okay and then to help you get the device back to it's factory settings to go through the setup again.
After you reset the Slingbox go to Slingbox.com/getstarted to start the setup.
The Slingbox Moderation Team