My hunter keeps dying of a big tree @ splintertree post.
Well, that can only happen if your toon is heading to or from splintertree post for a reason other then questing. That could be if your bags got full and it wants to sell/repair, or if you didn't disable the learn new skills option in HB. Equip your hunter with more/bigger bags.
In the profile I made sure that you will never take that route when traveling to that location.
Please do post what the current task was if that happens again and a log file would also be helpful