Lag issues

I keep getting a very bad connection to the server in the evening. My Ping is mostly around 30-50 seconds then. And im pretty sure it has nothing to do with an overload of our local “internet line” because i can play other online games without any laggs.

The lag usually starts around 18-21 o’Clock (CET / UTC + 1:00). I can’t really tell when it stops because im no longer at the PC then, but its definitly after 0:00.