Thanks for using the forums. Sorry to hear you are having issues with your wifi. It is possible to hardwire the router to the Slingbox and use an ethernet connection, as long as your cable box is close enough to your router to be connected to both the cable box and router at the same time. This would have to be done at the Slingbox location though. The article below should help you further with resetting the connection, but you will want to click on ethernet instead of wifi.
The Sling Moderation Team