Happening to me since an hour ago, I was fighting Ifrit, and 3/7 of our people DCed right when hellfire went off (the 8th person DCed right at the start of the fight and didn't come back). Fun fight to recover from XD;

The same people kept DCing off and on, and it seems like other groups who were doing Ifrit were having the same problem I personally DCed 4-5 times so far, and have red circles all over the place and massive lag.