For many months we already have the issue that games are played on Brasil server, while it was better to play them at another server. Therefore players notice lag at that server. This is still in the game and needs to be fixed. The latest patch introduced a new kind of lag and this is currently the main source of the lag and disconnections. See the following thread:
I do expect a hotfix for this issue. The devs have stated they are working on a hotfix for this new issue. So this lag and connection issues will be patched soon. For more info about this bug, have a look in the thread in the bug forum
I also hope they have a look at the algorithm behind picking the server, so we wont end up with too many game on Brasil that dont used to be played at Brasil server. I have no idea if the devs also look in this issue. Since it is already in the game for months, i dont think this has high priority.