Thank you for using the forms. Sorry to hear you are having an issue with using your iPad and the Roku.
If the Roku works using an android phone, the issue sounds like it lies within the iPad. I would recommend making sure your iPad has a solid wifi connection, is on the same wifi as the roku, and uninstalling and reinstalling the app. After you try these steps, the iPad should connect again to the Roku.
Hope this helps,
The Sling Moderation Team