I do apologize for the issues you are running into. Since you are able to connect on your phone but not able to send the video and audio over to your Roku device, I would recommend uninstalling and reinstalling the application on your phone to see if this helps. If this does not help, I would recommend powering down both the Roku device and Android phone. If this is still unsuccessful, you could try disconnecting the Roku from the network and reconnecting it to see if the network connection just needed to be refreshed.
This article will futher instruct you on how to uninstall and reinstall the application on your phone:
If you have any other questions, feel free to give us a call at 1-877-467-5464. We are open seven days a week, from 10:00am to 10:00pm EST.
Sling Media Moderation Team