Picture Screen goes Gray & coding shows up

 Every hour this or similar pops up

No matter what time the tv is turned on, every hour there after this screen pops up. The tv screen just goes gray and this or something very similar shows up. We shut everything off and then the tv works again for an hour. This happens either watching live tv or dvr. We have done everything from resetting to rebooting the wireless box modem etc. we just received a new wireless cable box and it is still happening. It only happens on one tv. The other 2 are fine. Called customer service numerous times but they can’t help and no way to send them this picture. Very hard to explain the issue on the phone without seeing this picture above.