Ping varies too much

Hello, dear dev team, I really hope that someone sees this, I don’t know why but on EU server

Sometimes my ping is over 60, and sometimes it doesn't even exceed 30. While my internet connection stays the same, Also I can see this difference if I switch maps, just now I’ve played on a day map with a 70 ping at then loaded into crypts and my ping was around 25…

There is a very noticeable difference, and it is literally impossible to play with 60 ping if you are even a little serious about PvP. Please I’m really want you to take a look on that, thanks.