We would be more than happy to look into this issue. Can you please provide us with more information:
-Roku device model, serial number, device ID, and software OS/version (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
-what external devices are you connecting in your home theater setup
With more detailed information, we will be able to investigate further.