Solving playback issues

Help with audio & video playback issues, TV display type recognition & compatibility, HDCP messages, troubleshooting playback errors, advertisements, and resolving power issues.
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Level 9

“No Signal” message upon changing inputs!!

So I had an issue of “no signal” after my tv had been off for a while, requiring a power cycle to correct it.  - new Samsung smart tv, new Roku stick+. Upon research, I changed the display from 4K to 1080P, and that fixed the issue. However, I recently added a cable box to another HDMI input, and now again whenever I turn on the tv and the cable box input is on, the Roku input displays the same “no signal” message, requiring a power cycle. This is extremely frustrating as my tv does not seem to be able to detect the roku when it’s off and on a different input. Can anyone offer a suggestion?