Internet connection keeps dropping

This happens on both wireless and Ethernet connections.  This happens of my kindle, my Samsung phone, even our wireless printer has failed when we try to print something off the internet.  We have had the router replaced twice, the router moved from the TV room to the computer room, about 20 feet away.  The router was placed next to the TV at the recommendation of the COX tech.  Then the next tech said they only tested over an Ethernet connection, if that worked then everything was good. So we had the router moved and the PC physically connected.   Also both TVs pixilate on a regular basis,  We have been a COX customer for almost 15 years and have never had this problem before.  Since we have moved into our new house we have had noting but problems. (over a year)

The systems seem to hang and after 15 - 30 seconds it is good again, until the next time.  This happens 6 - 7 times a day.

 When the techs came to the house they saw nothing wrong within or outside the house.  We have been in IT for over 30 years and the last time I had this much trouble was when Ethernet first came out.