Is the no signal error message on tv while streaming with apple tv from the TV or the router box or from Apple TV?

Thanks for your response. It started happening with WIFI connection so got new ethernet cable and also happens with cable which is connected properly. No signal message comes about ten minutes before and/or after the hour and half hour. Sometimes it comes on the hour or half hour but mostly 10 minutes before and after the hour and half hour. Could Cox my ISP be throttling internet service causing this issue? They said to check APPLE TV box when I called Cox internet support.

Hi, you may be right about the HDMI cable. I may need a new cable. Do they wear out? Will this cable Philips 4' High Speed HDMI Cable with Ethernet because it is with ethernet work if I replace original apple HDMI cable for 3rd generation APPLE TV model A1469?

Yes, you are all right because it was a combination of these things. I changed the wall plug extension cord socket after unplugging apple TV box at the wall overnight. After I plugged the apple tv power line into the different extension cord socket, I unsynced the old remote and synced up the new one and now all works fine. I will eventually replace the old extension cord causing the problem, but for now the temporary fix works great. A combination of this community comments and some other stuff online did the trick so thanks all!