all online games lag or freeze

I signed up for Cox internet in Southern California 2 months ago and have had issues ever since.  While i'm playing any online game it will freeze for 1-5 seconds.  This will occur almost once a minute sometimes more.  At first i thought it was my pc but what ever is causing this is affecting all my computers that are wired directly to my router.  It is a Netgear N900 CG4500BD rented from cox.  I've contact Cox multiple times and even had a tech come out but were not able to figure it out.  I've noticed just today that if i'm pinging the router when the freezes occur, the ping will time out or have a very high reply time over 1000ms.  I've pinged my router from all of my computers and i've confirmed that this ping timeout is only occuring on devices wired directly to the router.  Anything over wifi do not see this issue.  I have replaced my router twice now and each time this issue is still there.