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Yes, I have a 65 inch Samsung UHD TV that has a box where the cable hdmi goes into then from that box to the TV. Also my AVR connects to that small box with HDMI for the audio.
I'm referring to a frequent loss of signal where the TV and sound go black. Occassionally the loss of signal will be long enough for a message to appear. But that is rare. No rebooting of the cable box but I have done that to see if that would fix the issue.
We have had signal issues for over a year. We have upgraded our cable tv service to the X1 equipment and no differences. I have swapped out the splitter and had a tech out here who did the same. His signal box indicated no issues. It typically is worse in the morning and it is across all channels. The tech provided us a phone number which we have not used to call if it continues to be an issue. It is a non Comcast/Xfinity number. I have the best HDMI cables and of course have checked the connections. The only option I haven't tried is to run a longer coaxial cable to an outlet about 10 feet away. Internet seems to have no loss of signal during these frequent singal interruptions that last anywhere from 2-15 seconds. Thanks for any feedback.