Super Annoying!! I just hit
Xfinity button- gear wheel-Device settings - scroll down to power preferences- then restart!
Once your cable box restarts you will be able to REWIND normally.
You can just power off our cable box manually by hitting the power button or pulling the plug from the wall outlet and back in again.
Hope this helps!!! <Edited> If you continue to have an issue, I recommend replacing it at a Comcast/Xfinity store. Just bring your box, cables, and remote and they will replace it for no charge.
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