Welcome to the Roku Community, @Lzottoli!
Thanks for letting us know about this issue you had with your Roku TV since it displayed poor picture quality on the Netflix channel when livestream. We're happy to help.
Please try to update the channel by highlighting the channel tile, pressing the star button on your Roku remote, and selecting Check for updates.
If the problem persists, keep us posted.
Best,
The Roku Community Team
John
Roku Community Moderator