Roku TV keeps losing connection to internet?

Since upgrading my service and renting Cox equipment, still intermittently, but daily, losing connection to internet.  It is NOT the location off the modem.  Tried two modems, both were part of the problem.  Tech #1 came out and changed outside box, one hour later Cox was down and fixing something.  Still problems.  Tech #2 came out and swapped it for a newer model Gateway.  At least this modem's fan doesn't run constantly.  Thought issues resolved, but now losing connection daily.  Pops up on Roku TV.  Yes, modem has been unplugged and reset.  This is a Cox problem!  Last tech could even get the box in the street open. 

Any one having any suggestions?