So on eu server there is that problem with wastrel stage 2 the sometimes mobs stop spawnin, i went 16 run today, mostly solo and 15 times get this bug, but actualy noticed that if dont hit the crystal than the mobs gonna respawn just fine, i mean when i gahtered the mob’s under the cryst and used any type of aoe attack they stoped respawn but if i drained down ther hp away from the crystal lured them under and finished them with basic attacks there wasnt any problem, so i didnt tested it with melee weapons since those have aoe but i was able to pass stage 2 with out a problem as a long i didnt hit the crystal with skills, idk if this topic was already anserwed in this forum and sorry for my bad english but if some one get this bug i hope this can help ( Its not a Bug its a Feature)
Good farm Schyter