Raid Expedition: The Doomscale Horde

saturday while doing this raid, some guildies couldnt cast anything. On the waves all was ok but on Deathmaster Sareth some of us couldnt cast anything for long period of time... and when we could, sometime later we couldnt cast again... (happened to me 3 times and know other guildies also)
Did it happen to anyone else?

I've never had that happen, but seems as if it was server lag, not related to the raid at all. We ran it yesterday and had zero issues.

The raid crashed on us last week, immediately when we started it. First and only time it's ever happened.

I've had this issue in a different CotF raid, as have others. Try ducking and standing up again.

Ducking and standing works on K2 if you were imprisoned and tried to cast a spell to clear it. On any other raid sounds like lag spikes.

We had huge lag spikes on Rathe while raiding last night, in multiple different CoTF raids. Chat was very laggy as well, up to 5-10 second delay.

/stopcast sometimes clears these too.