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How are you routing the Polk audio. X1 box to Polk audio to the tv? If that’s the case Try routing x1 box to hdmi port #1 then from tv ARC hdmi port #4 to the audio system. That’s how I had to rout my HDMI cable and it works Good luck ... View more

Hello, I had the same issue with my Samsung TV. This is what I did to fix it and for the las 2 month it’s been working ok. 1 replaced the provided Comcast cable with HDMI cable 2.0 / HDCP 2.2 compatible from Amazon or Bestbuy. 2 route the HDMI cable from the XG1v4 box direct to the TV HDMI port #1, if you route it via a sound bar then to the tv it may not work. You can then use another cable from the ARC tv port to the sound system. 3 Allow the box to update at night, I believe Xfinity has been rolling out firmware fixes for individual TV models. This fixed my problem, I no longer have to reboot the box, but this issue is a TV / Topbox hand shake issue it works for some units but not for others. Give it a try and let me know. ... View more

I connected xg1v4 direct to the #1 HDMI port on my Samsung TV with a 2.0/2.2 HDMI cable (not the Comcast provided cable) Use the ARC port to connect the Sound bar with the Comcast provided HDMI cable and that did the trick. Also try turning the box off at night, you can voice command the remote to “power down” you will see the light go off. You may need to use the tv remote to turn the tv off. This allows the box to update it’s firmware at midnight. Hope this helps you solve the problem. ... View more

I had the same issue, reboot  the 4K box every day,  found a solution in another forum. The problem is the HDMI cable provided by Comcast. You will need to replace it with a HDMI 2.0, HDCP 2.2 After replacing the cable with the one purcased from Amazon the rebooting issue was fixed.    ... View more