Solving playback issues

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Roku 4800 Random blank screen

My Roku 4800 will have random blank screen for a few seconds, this will happen some times at start, or after a few minutes. This will some times happen several times in a row. I have reset the unit, changed HDMI cables, reset networt, also tried both wireless and wired connections. Changed remote batteries and repaired remote. The unit has now been moved to a different Tv that is not used as frequent.

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