I have 2 Roku Ultra's. Only one seems to have this problem. Periodically the screen just goes black with no sound. It looked like it lost the HDMI handshake, so I pulled the HDMI cable and replugged it. Most of the time that fixed it. Until it happens again maybe a week or so later. I have tried all 3 HDMI ports on my TV and rebooted the Roku. I get the same result.
I see many complaints about this issue. Has it been solved?