NEED ANSWER WHY DOES THIS HAPPEN

I too am having this issue Ive tried multiple thing to resolve this issue I have a pretty high end computer
just happen less 2 min ago<10:30pm EST.> again i was in The "Boyahda Tree" killing steelshell to do some skilling dagger and it just keep locking up my computer sometimes 10mins other 30mins it would lock up and i cant do anything but reset the PC

Ive tried checking for registry key error missing .ddl files reinstalling the game on my regular hard drive instead of ssd changing bios on my graphics card and going to an older set of drivers and still keep happening the funny thing is that this just started happening it hasn't happen before the first time it happen i was in SKY killing seiryu and just froze up lucky i mange to kill him before it happen or i would have been pissed I am getting really sick of having to reset my PC every time that isnt good for my PC i need a solution to this please i really like this game ive been playing on and off for more then 7+ years i really would hate to have to stop.
AMD x6 1090t
x2 OCZ SSD 60Gig
Corsair Vengence Ram 8gig
XFX ATI HD 6950
Asus formula 4 mobo
WD 1.5tb traditional hard drive