I can confirm this same thing happened for my whole team on Phoenix yesterday around 9:00pm GMT and the day before at approximately the same time. We've so far not been able to complete it because our tank lags so much and his combo's don't work correctly, sometimes he uses a buff and it doesn't actually go off but goes on cooldown, and he has a hard time dodging anything. These problems occur on the first boss but are so bad by the second it's basically unplayable for him. Also our healer disconnects at various times throughout, and myself and the other DPS have very bad lag issues as well. Never had this problem with the same party on any other dungeon thus far. I also had a strange issue in the AV yesterday where no matter how many times I cast a song it never worked.