Could you please provide us with 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 by selecting the channel on the Home screen and pressing the * button)
-Tracker ID when this issue occurs (when you see this issue occur, press the Home button 5 times, followed by the Back button 5 times)
-Steps to reproduce the issue you are seeing
With more information, we will be able to assist you further.