I see you're not the only one with these kinds of problems, when I started playing I frequently got these late at the end of duty for being bad at the game or so they like to say. I was also kicked on the last boss of the dungeon for no reason, I felt hopeless after that I contacted the gm for the first time and he told me it was something called griefing which happend to me but on whole it was like 20% of the dungeons I did were toxic at earlier stages. Id like to believe that it was because I was playing and am playing a Tank role job.