Unkillable Boss and resurrection mobs

Had two separate issues here beginning of act two the First boss, I hit a point where the boss fully healed stopped attacking and minions would spawn continually. I thought originally might be part of the fight but after a bit i couldn't see any change(no xp gain for minions killed) and was able to teleport out of there. (Character died shortly thereafter no further issues in standard mode). Next and similar(?) issue was in Manor Ramparts had a yellow/gold monster was chasing me(one minion and a random mob as well) no matter how many times I killed them they would resurrect full health even after death. I killed all three multiple time(never all three at once). They would go through full death animation and leave the pool of blood after the death explosion which did also cause damage.