Basically I also had some issues with all pets of late , it was very noticable in the GG event cave .
The main issue as I see it is pet tracking in different terrain.
Senerio
The map has multiple doors bends or alleys with mobs in each "lane" your clearing a lane and the pets are with you then when you round a bend or a corner or an obstruction they try and follow you get confused and just lag there or wonder off in the direction you came from , many times had to rest pets , move as far as I could away from pets and then attack all summon them to get them past the bend or door etc on the map.
Thier behaviour when following you is slow they dont keep up with you as should , also switching from amulet to posion seems to freeze them as well or when you use toxic when on assist then switch to amulet and use e.g. thousand swords they seem to not know which target to adhere to so just stop ... then have to think again which target to attack often this results in them taking unwanted damage or you having to re hit another group closer to them in order for them to re engage.
Maybe i havent explained well , its hard to put actions ingame into words ,
welcome Scorps to watch me in a cave on observer mode and I can re create it for you ,Orcs city is 1 area thats a pain with the delay ....
I