I totally hit some crazy bugs on hard mode last night:
*Sometimes we got teleported WITH the shields, dying almost instantly
*Sometimes enemies would become invulnerable and often stop moving
*A couple of us got kicked randomly
*Aetheon shot through the relic shield (we almost had him at that point! Aaaaah!)
*Sometimes the adds in the portals would know we were coming too early
*Sometimes we died just walking through a portal. No reason.
*Sometimes the portal wouldn't transport us.
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Similar issues but the add waiting for your arrival is just one instance the adds spawn and stupid AI's that just make them walk around.