Solving playback issues

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Roku going black for a few seconds repeatedly and nonstop

I have multiple roku devices and all of them have started to randomly go to a black screen for a couple seconds and then back to what I was watching. It happens in all apps and even on the home screen.

I already had Auto-adjust display refresh rate turned off on all devices before it started happening and all apps and the rokus are updated so those are not the issue.

All other devices (PS5, cable box, Switch) work fine so it's not the TV.

I switched HDMI cables and it didn't fix it so it's not that.

Internet connection is working great so it's not that either.

It just started this week and I have no idea how to make it stop.

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