Hi, @ljgoz
Welcome!
I understand that you are having an issue with the screen mirroring on Roku TV. I'm here to provide you with troubleshooting steps that can help address the issue.
It is recommended to perform a system restart. To perform a system restart on your Roku device, navigate to Settings > System > Power > System Restart.
Give this a try and keep us posted.
Thanks,
Roku Community Team
Takashi O.
Roku Community Moderator