Brand new Roku Express 4K+ plugged into wall outlet as recommended. When tv is off for a little while the Roku powers off, too, and I have to physically reset or re-plug it. There is never a white light, only a blue light when I reset it. Tried plugging into a different outlet but got same result.
You don't have to unplug it; just press Home on the remote (or any non-TV control button) and it should wake up. There's a new "power saving" option under Settings->System->Power you can disable if you don't like that behavior.
Roku Community Streaming Expert
Help others find this answer and click "Accept as Solution." If you appreciate my answer, maybe give me a Kudo.