Pretty simple actually, before the game and every player had to wait for the lagging player to catch up and that lagged the game for everyone. Now if a player has worthless internet with lots of packet loss they can simply loose the connection all together since the game is progressing and not waiting around for the lagging player.
That its WFA fault is just BS. The Battleservers came shorthly before WFA was released so it might be returning players or just coincidence that someone got dropped after WFA was released.
Easy solution is get better internet, its not the games fault its YOU. k thx.
The battle servers have been around a while now and do work in the way described . A lagging player will freeze and then fast forward to catch-up. Many players had not experienced this until recently and so were a bit mystified. Something has changed since wfa or a recent patch as it has been happening more frequently for more people.