The Hidden Forest

I had some problems on 9/14/15 in Natimbi. Buffs and heals would not take hold. Mobs would die and I would get the exp message but they would appear to still be alive.
When I zoned out I noticed all the buffs I had casted did take hold, they just did not appear. By then the mobs that were kills appeared as corpses but I could not loot them. A new mob would spawn on top of the dead one.
I couldn't heal my bot. Heals would not take hold on him. I had to zone out to heal him.

This was not consistent though: sometimes it would work fine, while at other times the problems as listed above would happen.

I checked my internet and I had a strong connection all the time. I also rebooted my machine and made sure my patch is up to date.

This was a cleric with a warrior bot.

Hmm, there were only one zone crash since 9/1/15 and that was in Shadowhaven. Any way to reproduce the issue? Was this issue persistent every time you zoned out and back in?

I have been having problems in Natimbi for the last week or so as well. It would appear that my character was just standing there alone, but I was being attacked by invisible mobs, which I noticed because my hp was decreasing and the occasional critical hit would appear in the chat box. My sister plays on THF and she also had the same problems in Natimbi. The problem persisted even when I zoned out and came back.

I wonder if those mobs fell below the world and were attacking you from below. Will take a look at it, thanks.