Controller disconnecting/reconnecting & Error message when exiting the game

[Zetsumei_Tsunarashi]

I've been using xbox 360 wired controllers for a long time now, and usually when this starts happening it's time to get a new controller as the connectors to the circuit board inside the wire start to become loose and you start having connectivity issues.

You can test this by moving the wire around close to where it goes into the controller itself and see if you get the connect/disconnect windows sounds while moving the wire.

If it's not this, then it could be an issue with either the USB connector or the USB port on your computer. Trying using different USB ports and see if you have the same problem.

XIV sometimes has problems recognizing USB devices that are connected while the client is already running, so if your controller lost connection for some reason while the client is running, it may not register your button presses until you restart the client. This could explain why it seems like your controller stopped working only in XIV.