After our neighborhoods power momentarily went off and on, the Roku Ultra displays a black rectangle at the bottom of the screen. I’ve done a factory reset and it’s still there. I have checked other video sources, only the Roku is affected.
I suspect this was something your tv was doing, not your Roku, but I guess we'll never know for sure. Thanks for reporting back so people won't have to waste time asking questions and making suggestions that are no longer needed.
Roku Streaming Stick +, 3810X, Ser YH0059427035, wifi - Samsung UN55ES6100
Roku Streaming Stick, 3600X, Ser 5S56D8240827, wifi - JVC EM37T
Mine is doing something very simar, except instead of one large rectangle, its a bunch of small ones scattered across the screen. Its only on the operating system... but somehow the “ad” for movies is unaffected. if I go into apps (netflix, HDMI ports) the screen is completely fine.
However, if I change the volume or mute it, the icon that usually shows up in the top right is missing the image within the volume circle.
it happened a couple days ago, then it was fine yesterday, and its happening again today. If anyone had any ideas that would be awesome otherwise I might have to return the TV