I'm no expert but sometimes I know it is from SE end. From the last patch before stormblood until its release for some reason I went through a phase that I would crash 2-3 times in a space of 1-2hrs. Since stormblood it went back to normal again. Although I still get the odd crash that I guess can be "normal" for a mmo. I have a GTX 980. Never really had any problems (only those weeks with ffxiv) with any other games.