Zana rotations nearly unplayable for me

so when I do zana rotations (about 1/3rd of the way through 7) I crash if I stay with the group, I crash if I am a screen or two behind the group. The only way I don't crash is if I sit beside the portal and wait for the rest of the group to finish the mission.

I don't crash in solo play, and I could carry the group if they wanted to stay back (50k pierce GMP tooltip kinetic blast) and I can't say for sure when I started crashing like this (it used to be the rare 1 in 20 group zana's or so) but in the last week its become every single map. so I'm sitting beside the portal waiting for my party to finish zana as I type this.

I am not sure if this is a common problem, but I already had 1 player in our group quit because he was crashing the same as I and said it was pissing him off to much.

I really don't consider this an acceptable work-around for the bug if this is affecting a large group of players, and I think zana challenge should be disabled until people can group without crashing.

TLDR, disable and remove zana challenge from this league and only re-introduce it if common player crashing problems are fixed.