Is this issue happening on a specific channel or does it happen across all channels? If you are unable to resolve the issue, can you please provide us the following information:
-Roku device model
(these can all be found in Settings > System > About)
-does this issue occur on a specific channel? if so, what channel and what version/build is the channel (this can be found be selecting the channel on the Home screen and pressing the * button)
-steps to reproduce the issue you are seeing
-screenshot of the issue you are seeing
With more information, we will be able to assist you further.