WHAT is this??????!!!

**I'm extremely mad at the moment since I was using a pair of Bluetooth head headphones during my game, and when I disconnect them, my game crashed out of nowhere, and I had to shut down my pc to fix it! I have never seen this happened before please explain, and it crashes a second after I disconnected my Bluetooth headphones. I just want to know what caused this, if it wasn't my headphones than what?! **