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Sound goes off about evert 15 min or so for about 5-7sec.This is the main cable box for the x1 tv in LR.The one BR (small box) doesn't have this problem.
is there a receiver or sound bar on the main cable box? how are your HDMI cables connected?
I have escalated your issue to the Comcast Team available to these forums. Check back often for a reply in this thread from a Comcast Official Employee.
Can't easily do this because the HDMI cable is down thru back wall.Can probably just temporarily unplug both TV and cable box inputs and try new cable.Any Other more likely pssibilities?