You might check this link;
We need to get more information about the issue you're having like the type of connection between the Slingbox and the computer to the router (hardwired, wireless, using a wireless/power bridge), if you are using SlingLinks you can check this article,
If the issue persists, you can connect the Slingbox and the PC hardwired to the router and reset the Slingbox,
Let us know how it works.
The Slingbox Answers Forum Moderation Team