So the last few days I've ben enjoying the new update, there's a pretty nice improvement in corpse recovery and I love that.
Though in my playthrough I've experienced some really weird rips caused by damage spike literally out of nowhere (I'm playing holy melee paladin btw, so max res,nice defence but rather low life), these sudden deaths usually happened at Act 2 and Act 4.
The first one is Arcane Toad in act 2 Lost City and Claw Viper Temple, he deals HUGE damage with his magic missle, it also doesn't help that it's magic damage and always hit, I don't think he dealt that much damage before that patch cause I've never been ripped to him before.
The second one is Horro Sorcerer in the first few zone of Act 4,I had all res max at 75% and they still dealt an absurd amount of damage, I literally Zerg rush through those zone in Terror cause I'd got 3 shotted by those mobs. The weird thing is that none of the Elite mob (Heretic, Corrupted Bone Warlock,...) in that area can gave me as much trouble as those white mobs
Unusual damage spike from trash mob
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Since Istaryu is a jackass I'll answer you 
Monsters health and damage have been reworked recently and monsters who just completely sucked and didn't do anything now have some purpose, vice versa enemies who absolutely wrecked deal less damage. Silverbolts had to be brought down a bit after this edit because they wrecked house. Do keep in mind as well that if enemies are doing magic damage your character most likely has no defense against it as magic resist is the most rare in the game.
Monsters health and damage have been reworked recently and monsters who just completely sucked and didn't do anything now have some purpose, vice versa enemies who absolutely wrecked deal less damage. Silverbolts had to be brought down a bit after this edit because they wrecked house. Do keep in mind as well that if enemies are doing magic damage your character most likely has no defense against it as magic resist is the most rare in the game.