Do you have a Series X? I have an Xbox Series X and had this problem for about a month on MW and Warzone, but not Cold War. Constant packet burst and it pisses me off. Have some videos of it too. You can take a look and see if we have the same issue. I've contacted Activision support multiple times about it, they say they will have to "refer it to their other team to diagnose the issue." I've also done the same with Microsoft support, and they say it's on Activision's end. Not sure it entirely is though, because it works fine on Cold War, and this didn't happen on my Xbox One S.