We're sorry to hear about the issue you're experiencing.
In addition to what @renojim has said, please be advised that each Roku TV manufacturer provides direct support and warranty services for their products running the Roku OS. We'd recommend reaching out to the TV manufacturer to report the issue and get help.
If this problem is not resolved, please let us know, along with any additional information you may have that would be useful for our team to investigate. Please include the serial number of your Roku device so that we can assist you further.