I don't know what it is, but it is only FFXIV that has this issue. World of Warcraft doesn't have this, and none of my other games either.

One of two things happens if I accidentally unplug the headset while in game: It either A: completely crashes the game, or B: I lose all sound and have to restart the game to get sound back.

PC
Windows 10 Pro 64bit
Video Card: SLI Nvidia 970 (Latest Drivers)
DirectX 11 Mode
Ram: 16GB
Processor: i7 4770K 3.5GHZ
Headset: USB SteelSeries Siberia v2 (Latest Drivers)
Character: Any
Time: Any
Zone: Any
USB 3.0 and 2.0 but it doesn't matter which one I use.