Hi, @dxter!
Thank you for your first post in the Roku Community. We apologize for the inconvenience you experienced while trying to access YouTube on your phone.
It is possible that there is an issue with the data stored on your YouTube app, which could be causing the problem you are experiencing. To fix this, you will need to uninstall and then reinstall the YouTube app or check for an available update of the app.
Let us know how it goes and if there's anything else we can do to further assist you.
All the best,
Elmer
Elmer H.
Roku Community Moderator