Roku Ultra is turning itself on and off
I am having the same issue. I just cut the cable and installed Roku ultras on 3 Tv sets. One was an older unit that I had tried couple of years later, and found it too cumbersome to switch back and forth between it and cable. It is working fine, the local IT guy who does a lot of that got two new ultra LT units and installed and got everything running. One of the new ones shuts down and gives a black picture at random times, and it is difficult to get it going again. I called them and we tried a few things, finally moving it to another room and tv set, where it continued to do the same thing. Called back and the tech who installed said they would just get a new unit and replace that one, that it was probably a defective unit since it did the same thing in different location, different HDMI cable and power supply.