Ive never come across any of these issues you are saying here. And my PC hardly goes above 40-55celsius, and I'm running the game at max settings except AO and Depth of field.

Would be nice if you could post the specs of your PCs: Motherboard, CPU, RAM, GPU etc
My PC is: Intel i7 920, 6gb ram, Asus P6T Deluxe x2, Asus Radeon 6970HD, Casing is Coolermaster HAF932Big. And FFXIV is installed on SSD drives.