We're sorry to hear that you're having this experience with The Roku channel. I will do our best to assist you.
Kindly remove the channel from the Roku home screen by navigating to the channel tile, pressing the * key on your remote, and choosing 'Remove channel'. Then restart your device from Settings>System>System restart. Once your player starts up again, add the channel back once more.
Let us know if there's any difference after.