Can't Complete Certain Quests - Very Frustrated

I have found 2 quests that are preventing me from progressing in the game.

The first is on my Brewmaster, when trying for his Artifact Weapon in Legion I get stuck on the quest The Monkey King’s Challenge as every time the Brew status gets to 4/6 it just resets in an infinite loop. Can’t find a way around it. So that character is essentially stuck as I am wanting to unlock that particular weapon.

The second is on a brand new Death Knight, During the quest Death Comes From On High my game disconnects every time the eye enters the city. No way around this quest either, as it is mandatory to even progress in the Death Knight area.

How am I supposed to play the characters I want, when the game itself is preventing me from progressing? This isn’t even new content, how can old content start becoming bugged? Makes no sense.

I would try a full ui reset for the second by deleting ur cache interface wtf folders then without any addons not the same as installing or disabling the try using the eye again. The ui mite fix the first but id report it as a bug.