We need you to be more specific. Unfortunately, your post is not clear enough and we need you to provide as much information as possible. Do you have this issue only remotely or at the Slingbox location too? How is the Slingbox connected to the router? Which is the Internet Speed at home?. If the issue is only remotely I recommend that you take a look a this link
If you have the same trouble locally, you can try the steps that we have at this link;
Let us know how it works.