If your tablet is no longer responding, please quit the Rendever app on the tablet and restart it. To do this, tap the button the bottom left of the tablet that looks like two two squares, then click the small "x" in the top right corner of the Rendever app, closing Rendever. Then push the home button and tap the Rendever app to relaunch Rendever.
This allows the app to reboot, correcting the issue. You may have to start a new experience to regain control of the connected headsets, which will not be interrupted during the restarting process.