Press * then scroll to "Accessibility & Captions". Then go to "AUDIO TRACK". There it should say ENGLISH more than once. Mine didn't have anything after it. Just the word "English" twice, one didn't say "descriptive text" behind it, but it might have other language options. Just click on other "English" option. Should fix it! Drive me nuts too, boxes were all unchecked. This was the solution.
I have this same issue but only with Paramount star trek offerings and only on one roku device, yes I know how bizarre that sounds. But I can watch other show on paramount on that same roku device and works fine but if i turn on a star trek offering screen reader is activated. It does not show as activated on settings but it is on somehow.
Please be advised that channels on Roku are developed and maintained by the channel developer themselves. We suggest reaching out to the channel's customer support team to see if they have any additional settings or options within their app that may resolve the issue you're experiencing.
Look up the user RenoJim in this thread he had the solution. While it was a TV setting I still think somehow Roku caused this. If I switched to a old fashion antenna the problem disappeared. It was only on Roku/Paramount/Star trek series. very odd