I started the quest and i got to wave 3 then died XD (I wasn't exactly prepared for the job). After i re-spawned, i talked to the Ghostly Tinkerer again and the invasion started off at wave 3 once again; where i had died. I finished wave 3 but right after it said that i had failed the quest. Now every time i return to the Ghostly Tinkerer to get the quest, it shows the countdown but then right after, says i failed the quest. (I can see the the Wave # and Zombie count though). I have also disconnected and reconnected.