It's been like this since the start of March for us, my group managed to complete it for the first time during this awful weird lag, but we won't be trying it again until we know it's fixed. Some of my party need to do it again for GC rank up, really not looking forward to such unpredictable lag again, so really, really hoping it's fixed asap. There was a bug thread posted just after it started happening that's been moved to accepted bugs, so I guess we just have to keep waiting and hoping they fix it soon.