Thank you for responding. I confirmed and reset-reloaded the Roku Ultra as you indicated. However that did not resolve the issue I am seeing. I believe I now know the issue better because of a lot of tests I performed, but don’t have an exact resolution for it.
I have a 4K LG-OLED that supports ‘Dolby Vision’. If I am on the Roku-Paramount+ main screen at the ‘Home’ menu, I get a screen display showing icons of shows I have been watching, trending movies, recommended movies, etc. When I scroll through, stop on, and highlight one of these show icons, it automatically starts a video preview clip in the top-half of the screen.
It is when this video clip is acquired that the black screen appears and ‘no signal’ is detected from the LG-TV. This occurs during the ROKU retrieving and prepping this video preview for display. After the video preview has been acquired and processed for display, it displays on the screen and it indicates ‘Dolby Vision’.
I have tested the RoKU on other TV sets in the house. The LG-OLED is the only one supporting Dolby-Vision. The black screen I experience for 3-10-seconds only occurs on the LG-OLED.
Another thing I notice is that these video previews do not automatically display on all TVs tested. I haven’t found a way to turn that off. If I could find a way to turn the video preview off, it would eliminate this display slowness issue on the LG.-OLED.
I should note my internet speed as indicated by the ROKU is around 230-Mbps.
My conclusion is that 230-Mbps Internet speed either isn’t fast enough when retrieving higher bandwidth video. Or, the ROKU-Ultra itself isn’t fast enough to process the ‘Dolby Video’ data stream quickly and smoothly. I should add that once a video preview is loaded, it works fine. It is just during the menu video preview processing where it slows down and become annoying. If I could turn off the video previews, it would be acceptable to me.