Thank your for posting your issue in our answers forum! I'm sorry to hear your Slingbox is constantly rebooting. What model Slingbox is it that you have? Also, is the Slingbox plugged into a wall outlet, or a power strip? It sounds like it could be an issue with the power supply if the Slingbox is not staying powered on. However, I would recommend resetting the Slingbox to factory settings, then going through the online setup again at setup.slingbox.com. This can resolve a lot of issues with the Slingbox. Below is an article that tells you how to do so. Feel free to reply to the post.
Hope this helps!
The Sling Moderation Team