Hi @lisago,
Welcome to the Roku Community!
We apologize for any inconvenience this may have caused you using the Guest Mode feature on your Roku device. That's not what we aim for.
Is your Roku TV restarting after setting your Roku device into Guest Mode? That's an indicator that it was set up successfully.
Please keep us posted regarding the behavior you are experiencing, and we'll be more than happy to continue assisting you further.
All the best,
Chel
Jecheal R.
Roku Community Moderator