Elderslayer Invitation Crashing everytime

Dunno what is causing it, I play Arakali Raise Spiders Poison Champion. Everytime I do this invitation it crashes about half way through and there is no way to get back into the instance, I have had guild members also try but they get instantly DCed.

Now it even happened on the Elder Guardian invitation. I am also using no MTX as I first tought that might be the issue.