Mythic Eonar is bugged

Trying to run Mythic Eonar in Antorus but it is bugged. It will sometimes just randomly kill you while you are outside the Paraxis while Eonar has full/mostly full health. I am not staying on Paraxis when Purge goes off, Final doom isn’t going off either, and there are no Fel-Infused Destructors or whatever shelling down Eonar.

I am just randomly dropping dead and it’s getting incredibly frustrating. Combat log just says “[You Died]”, there is no damage source listed. I run this every week, and sometimes it just randomly kills you. Other times, it doesn’t kill you and you can run through the fight with no issue.