I am not on the forums often anymore but i havent seen this issue addressed and has happened to me twice. -blam!- who kick randoms (like me) to make room for their friends after we reached the final boss. I was kicked once right when we reached the final boss doing a level 34 PoE so they could make room for a friend of theirs and then just today with no explanation after a few failed Skolas attempts (probably because i dont have gally but i told them that very clearly when we started) This just makes PoE unbearable to play imo. I dont exactly know how it could be fixed or addressed but something as simple as no kicking once you have half way finished with the mission could be implemented
Offer comments and suggestions below besides
-get friends
-host all your games