My PC keeps restarting while playing FFXIV and it is strictly happening only when playing this game.

I have system automatically restart on failure clicked off but it still keeps happening.

I've been playing since beta and this has only started happening in the last couple days. I just had 2 restarts during boss fights in Aurum Vale, as if it couldn't get more frustrating. Yesterday it was happening after finishing up a fate in Bluefog 3 separate times.

I've updated everything, checked for viruses and researched on finding a solution and can't seem to find a fix. I cleaned the inside of my PC, got rid of all the dust and checked for overheating... running at 40-45 degrees.

I'm at a loss what to do next so any help is greatly appreciated.