Plugging my headphones disables Oxygen 61 MK4

So the keyboard works fine while i'm using speakers (connected to the back side of my pc) and once i plug in my headphones (connected to the front side) it somehow disables itself - meaning it's turned on, but somehow stops sending midi data. So i have to reboot computer and it works. Any idea why?

I'm using integrated sound card ALC 887 on Asus H97M-E, Windows 10.
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