It's possible that you what you are experiencing is related to Live TV pause. However, we would be happy to investigate this issue further.
Can you please provide us the following information:
-Roku device model
(these can all be found in Settings > System > About)
-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
Once we have this information, we will be able to investigate further.