Hello. Thank you for coming to JustAnswer.
Sorry for the wait. My name is Michael. I will be helping you with your question today. Do you still need assistance with this?
What I would suggest doing is resetting the Roku completely. This will require going through the setup again, but it will completely clear any temporary files that might be causing the probllem.
I have an article on how to do that with Roku devices here:
Let me know if you still have questions or issues.