The crash occurred with 2 different screen savers. The default one and another one that I tested. The crash occurs when I hit play for exiting the screen saver into my paused video that I was playing on YoutubeTV.
Try using any (non-TV control, if appropriate) button other than Play to dismiss the screensaver. I know it seems intuitive to use Play to restart your video, but that first button pressed when the screensaver is active only dismisses the screensaver and possibly installs some unwanted channel in the case of the Play button.
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I believe the problem stems from the mini-ads included in the screensaver. They advertise a program on a service other than YouTube TV and include the play button icon, which appears to mean that if you press play it will take you to that program, thereby closing YTTV and opening another app.
It's truly infuriating. After a lifetime of using play to resume a paused program, I now have to use another button? How unintuitive. What knucklehead at Roku thought this was a good idea?
UncleMilt: I don't think someone at Roku did this without thinking. I am pretty sure it was conscientious decision that nets Roku more money. I am pretty sure that "it causes a lot of problem" is very low on their priority list.
The easiest way to avoid this would be the recommendation of not pressing the Play or OK button on your remote from trying to wake up your Roku device from the screensaver. Have you tried pressing any of the directional buttons from the screensaver to see if the issue persists?