Do not have a resolution, just the same problem
Tried anything I can think off, including getting a new XG1v4. First XG1v$ box a few months ago. Changed back to older X1 due to the reboot issue. Old X1 worked great (until a power surge killed it). Just last week I got another XG1v4. Every morning I have to do a reboot. Disabled power save feature. Set the box to 1080 rather than 2160.
I can see on my Emotiva AV receiver that the box puts out a 1080/60 signal (black screen) with no sound (0 bits). Every cable, every piece of electronic, are to the latest 4k HDCP2.2 standards.
I guess I have to swap it out for the older box again...
This must be an issue Comcast is aware off. However, nothing is communicated to the techies nor users...
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