It was a pain to complete all 2 phases of fight with orb. And it's all because of matchmaking. I ran this about 20 times in random squads and only 2 of it was completed without errors. Other is: 1/3 - after leaving Deck 12 I see "connection lost" message and moved to Fortuna hub; 2/3 - Orb didn't spawn on Vallis.
I think this because of many gates in this event - you downloading Vallis level, then Deck 12 level, then Vallis again. In some cases it last minutes, so squadmembers just leave, because it not fun to wait and don't see how long.
I had to say, if you gather squad in orbit, you may not see this bugs, but if you ran missions with random players you may feel the experience I had.