Hello,
I wanted to chime in, we also have issues with X1 and Video/Audio dropouts. This is in the Seattle area.
It seems to happen in the evening mostly. We go through periods where the screen will go black, come back on 4-5 seconds later. Both Audio and Video cut out. Sometimes it will go dark for 1-2 minutes before coming back on. Of course we have called Comcast many times. They always do the typical, send a reset signal, and tell us that everything on their end looks ok and they don't have any service issues in the area.
We are using HDMI.
Our Setup:
X1 box to 2017 Pioneer AVR Receiver using HDMI. HDMI from the Pioneer to a 2017 LG Oled 65" (B6). All the HDMI cables have been replaced, and the amp has the latest specs. TV and AVR have the latest firmware.
We had a technician come out and determine that the signal from the main hub outside to the house was having issues, so they replaced that coax cable about two months ago. The problem continued even though the technicians say the signal coming to the box is fine now.
The technician came back and replaced the X1 box and also said it was likely the HDMI cable from the X1 box to the TV. I had doubts. I agreed to replace the cable. The new cable is a new 4K compatible cable and the problems continue.
The issue happens on multiple channels and if we rewind, it will play through, so it appears its signal being lost.
This is getting frustrating.